Error using mlapptools.getWebElements

## Summary
I am having troubles when using the following function : `[win, widgetID] = mlapptools.getWebElements(app.TabGroup);`

The issue is quite random. I can have issue 1 or issue 2, you can find below. I don't understand any of them. About issue 2 I looked what has been said about it on Matlab forum, like upgrade driver etc.. But I did it, tried the function on several computer and I still have it.


## Problem Description

Issue 1 : 

![errorappdesigner](https://user-images.githubusercontent.com/34058591/46661215-03ec3480-cbb9-11e8-8c6d-b2f52326adbc.JPG)

Issue 2 :

```
MATLAB crash file:C:\Users\hserus\AppData\Local\Temp\matlab_crash_dump.22480-1:


--------------------------------------------------------------------------------
         Access violation detected at mar. oct. 09 11:43:01 2018 +0200
--------------------------------------------------------------------------------

Configuration:
  Crash Decoding           : Disabled - No sandbox or build area path
  Crash Mode               : continue (default)
  Default Encoding         : windows-1252
  Deployed                 : false
  Graphics Driver          : Unknown hardware 
  Graphics card 1          : Intel Corporation ( 0x8086 ) Intel(R) HD Graphics 520 Version 23.20.16.4973 (2018-2-28)
  Java Version             : Java 1.8.0_152-b16 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
  MATLAB Architecture      : win64
  MATLAB Entitlement ID    : 3250676
  MATLAB Root              : C:\Program Files\MATLAB\R2018b
  MATLAB Version           : 9.5.0.944444 (R2018b)
  OpenGL                   : hardware
  Operating System         : Microsoft Windows 10 Professionnel
  Process ID               : 22480
  Processor ID             : x86 Family 6 Model 78 Stepping 3, GenuineIntel
  Session Key              : 7c2dcbac-278d-4f02-8001-dac683515e68
  Window System            : Version 10.0 (Build 17134)

Fault Count: 1


Abnormal termination

Register State (from fault):
  RAX = 000000000cf85b7e  RBX = 0000000300000000
  RCX = 0000000005f87ac0  RDX = 0000000000000003
  RSP = 00000000043f14c0  RBP = 0000000005f87ac0
  RSI = 0000000005f86be0  RDI = 000000000cf85b6f
 
   R8 = 0000000000000001   R9 = 0000000005f87ac0
  R10 = 000000004393e188  R11 = 00000000043f1560
  R12 = 0000000000000003  R13 = 000000003248cd00
  R14 = 0000000000000002  R15 = 0000000000000000
 
  RIP = 0000000180004c96  EFL = 00010203
 
   CS = 0033   FS = 0053   GS = 002b

Stack Trace (from fault):
[  0] 0x0000000180004c96                            bin\win64\pgo\libmx.dll+00019606 matrix::detail::noninlined::mx_array_api::mxUnshare+00004650
[  1] 0x000000018000de19                            bin\win64\pgo\libmx.dll+00056857 matrix::detail::noninlined::mx_array_api::mxPreparePropertyValueForContainment+00000217
[  2] 0x000000018000246d                            bin\win64\pgo\libmx.dll+00009325 matrix::detail::noninlined::mx_array_api::mxSetFieldByNumber+00000133
[  3] 0x00000000326e7a3c                        bin\win64\pgo\mcos_impl.dll+02849340 mwboost::serialization::singleton_module::unlock+01552008
[  4] 0x0000000032480c12                        bin\win64\pgo\mcos_impl.dll+00330770
[  5] 0x000000003247ba69                        bin\win64\pgo\mcos_impl.dll+00309865
[  6] 0x00000000326e2719                        bin\win64\pgo\mcos_impl.dll+02828057 mwboost::serialization::singleton_module::unlock+01530725
[  7] 0x0000000180039b5c                            bin\win64\pgo\libmx.dll+00236380 mxArray_tag::operator delete+00040924
[  8] 0x0000000180010296                            bin\win64\pgo\libmx.dll+00066198 matrix::detail::noninlined::mx_array_api::mxMustBe+00000138
[  9] 0x00000000e63916fa                 bin\win64\cellstructconversion.dll+00005882
[ 10] 0x000000001b33b724                     bin\win64\pgo\m_dispatcher.dll+00046884 Mdispatcher::getDispatcher+00002228
[ 11] 0x000000001b33cbe7                     bin\win64\pgo\m_dispatcher.dll+00052199 Mfh_MATLAB_fn_impl::dispatch_fh+00000343
[ 12] 0x000000001c1268f2                            bin\win64\pgo\m_lxe.dll+00420082
[ 13] 0x000000001c20fd3c                            bin\win64\pgo\m_lxe.dll+01375548 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00493568
[ 14] 0x000000001c21091c                            bin\win64\pgo\m_lxe.dll+01378588 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00496608
[ 15] 0x000000001c211c92                            bin\win64\pgo\m_lxe.dll+01383570 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00501590
[ 16] 0x000000001c2128f8                            bin\win64\pgo\m_lxe.dll+01386744 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00504764
[ 17] 0x000000001c211ddf                            bin\win64\pgo\m_lxe.dll+01383903 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00501923
[ 18] 0x000000001c211ede                            bin\win64\pgo\m_lxe.dll+01384158 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00502178
[ 19] 0x000000001c119a7d                            bin\win64\pgo\m_lxe.dll+00367229
[ 20] 0x000000001c12b265                            bin\win64\pgo\m_lxe.dll+00438885
[ 21] 0x000000001c128e26                            bin\win64\pgo\m_lxe.dll+00429606
[ 22] 0x000000001c128a24                            bin\win64\pgo\m_lxe.dll+00428580
[ 23] 0x000000001b33e007                     bin\win64\pgo\m_dispatcher.dll+00057351 Mfh_file::dispatch_fh_impl+00001111
[ 24] 0x000000001b33daf2                     bin\win64\pgo\m_dispatcher.dll+00056050 Mfh_file::dispatch_fh_with_reuse+00000066
[ 25] 0x0000000032499dc3                        bin\win64\pgo\mcos_impl.dll+00433603
[ 26] 0x0000000032494826                        bin\win64\pgo\mcos_impl.dll+00411686
[ 27] 0x000000003249347f                        bin\win64\pgo\mcos_impl.dll+00406655
[ 28] 0x000000003249234b                        bin\win64\pgo\mcos_impl.dll+00402251
[ 29] 0x0000000032492130                        bin\win64\pgo\mcos_impl.dll+00401712
[ 30] 0x0000000032491a3a                        bin\win64\pgo\mcos_impl.dll+00399930
[ 31] 0x000000001b33ca07                     bin\win64\pgo\m_dispatcher.dll+00051719 Mfh_MATLAB_fn_impl::dispatch_fh_with_reuse+00000343
[ 32] 0x000000001c1e263c                            bin\win64\pgo\m_lxe.dll+01189436 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00307456
[ 33] 0x000000001c11b8e7                            bin\win64\pgo\m_lxe.dll+00375015
[ 34] 0x000000001dbee1a1                            bin\win64\pgo\m_lxe.dll+28500385 mwboost::archive::detail::pointer_oserializer<mwboost::archive::binaryTerm_oarchive,MathWorks::lxe::MatlabIrTree>::save_object_ptr+00359557
[ 35] 0x000000001dbf729f                            bin\win64\pgo\m_lxe.dll+28537503 mwboost::archive::detail::pointer_oserializer<mwboost::archive::binaryTerm_oarchive,MathWorks::lxe::MatlabIrTree>::save_object_ptr+00396675
[ 36] 0x000000001c20fbfe                            bin\win64\pgo\m_lxe.dll+01375230 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00493250
[ 37] 0x000000001c21091c                            bin\win64\pgo\m_lxe.dll+01378588 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00496608
[ 38] 0x000000001c211c92                            bin\win64\pgo\m_lxe.dll+01383570 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00501590
[ 39] 0x000000001c2128f8                            bin\win64\pgo\m_lxe.dll+01386744 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00504764
[ 40] 0x000000001c211ddf                            bin\win64\pgo\m_lxe.dll+01383903 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00501923
[ 41] 0x000000001c211ede                            bin\win64\pgo\m_lxe.dll+01384158 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00502178
[ 42] 0x000000001c119a7d                            bin\win64\pgo\m_lxe.dll+00367229
[ 43] 0x000000001c12b265                            bin\win64\pgo\m_lxe.dll+00438885
[ 44] 0x000000001c128e26                            bin\win64\pgo\m_lxe.dll+00429606
[ 45] 0x000000001c128a24                            bin\win64\pgo\m_lxe.dll+00428580
[ 46] 0x000000001b33e007                     bin\win64\pgo\m_dispatcher.dll+00057351 Mfh_file::dispatch_fh_impl+00001111
[ 47] 0x000000001b33daf2                     bin\win64\pgo\m_dispatcher.dll+00056050 Mfh_file::dispatch_fh_with_reuse+00000066
[ 48] 0x0000000032499dc3                        bin\win64\pgo\mcos_impl.dll+00433603
[ 49] 0x0000000032494826                        bin\win64\pgo\mcos_impl.dll+00411686
[ 50] 0x000000003249347f                        bin\win64\pgo\mcos_impl.dll+00406655
[ 51] 0x000000003249234b                        bin\win64\pgo\mcos_impl.dll+00402251
[ 52] 0x0000000032492130                        bin\win64\pgo\mcos_impl.dll+00401712
[ 53] 0x0000000032491a3a                        bin\win64\pgo\mcos_impl.dll+00399930
[ 54] 0x000000001b33ca07                     bin\win64\pgo\m_dispatcher.dll+00051719 Mfh_MATLAB_fn_impl::dispatch_fh_with_reuse+00000343
[ 55] 0x000000001c1e263c                            bin\win64\pgo\m_lxe.dll+01189436 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00307456
[ 56] 0x000000001c11b8e7                            bin\win64\pgo\m_lxe.dll+00375015
[ 57] 0x000000001c2db5b9                            bin\win64\pgo\m_lxe.dll+02209209 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,std::vector<MathWorks::utl::attach_ptr<ir::IrTree>,std::allocator<MathWorks::utl::attach_ptr<ir::IrTree> > > >::load_object_data+00032749
[ 58] 0x000000001c114ceb                            bin\win64\pgo\m_lxe.dll+00347371
[ 59] 0x000000001c2a5cb3                            bin\win64\pgo\m_lxe.dll+01989811 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+01107831
[ 60] 0x000000001c2a5c35                            bin\win64\pgo\m_lxe.dll+01989685 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+01107705
[ 61] 0x000000001c20fd3c                            bin\win64\pgo\m_lxe.dll+01375548 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00493568
[ 62] 0x000000001c21091c                            bin\win64\pgo\m_lxe.dll+01378588 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00496608
[ 63] 0x000000001c211c92                            bin\win64\pgo\m_lxe.dll+01383570 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00501590
[ 64] 0x000000001c2128f8                            bin\win64\pgo\m_lxe.dll+01386744 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00504764
[ 65] 0x000000001c211ddf                            bin\win64\pgo\m_lxe.dll+01383903 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00501923
[ 66] 0x000000001c211ede                            bin\win64\pgo\m_lxe.dll+01384158 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00502178
[ 67] 0x000000001c119a7d                            bin\win64\pgo\m_lxe.dll+00367229
[ 68] 0x000000001c12b265                            bin\win64\pgo\m_lxe.dll+00438885
[ 69] 0x000000001c12a88c                            bin\win64\pgo\m_lxe.dll+00436364
[ 70] 0x000000001c12447d                            bin\win64\pgo\m_lxe.dll+00410749
[ 71] 0x000000001c123875                            bin\win64\pgo\m_lxe.dll+00407669
[ 72] 0x000000001c1234bc                            bin\win64\pgo\m_lxe.dll+00406716
[ 73] 0x000000001c123268                            bin\win64\pgo\m_lxe.dll+00406120
[ 74] 0x000000001c1e32e8                            bin\win64\pgo\m_lxe.dll+01192680 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00310700
[ 75] 0x000000001d7fdbda                            bin\win64\pgo\m_lxe.dll+24370138 mwboost::serialization::singleton<mwboost::archive::detail::extra_detail::guid_initializer<MathWorks::lxe::CodeClearEvent> >::get_mutable_instance+21916030
[ 76] 0x000000001bcf16a5                    bin\win64\pgo\m_interpreter.dll+00071333 inRunSaveObjFunction+00000313
[ 77] 0x000000001b33b724                     bin\win64\pgo\m_dispatcher.dll+00046884 Mdispatcher::getDispatcher+00002228
[ 78] 0x000000001b33cbe7                     bin\win64\pgo\m_dispatcher.dll+00052199 Mfh_MATLAB_fn_impl::dispatch_fh+00000343
[ 79] 0x000000001c1268f2                            bin\win64\pgo\m_lxe.dll+00420082
[ 80] 0x000000001c20fd3c                            bin\win64\pgo\m_lxe.dll+01375548 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00493568
[ 81] 0x000000001c21091c                            bin\win64\pgo\m_lxe.dll+01378588 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00496608
[ 82] 0x000000001c211c92                            bin\win64\pgo\m_lxe.dll+01383570 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00501590
[ 83] 0x000000001c2128f8                            bin\win64\pgo\m_lxe.dll+01386744 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00504764
[ 84] 0x000000001c211ddf                            bin\win64\pgo\m_lxe.dll+01383903 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00501923
[ 85] 0x000000001c211ede                            bin\win64\pgo\m_lxe.dll+01384158 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00502178
[ 86] 0x000000001c119a7d                            bin\win64\pgo\m_lxe.dll+00367229
[ 87] 0x000000001c12b265                            bin\win64\pgo\m_lxe.dll+00438885
[ 88] 0x000000001c12a88c                            bin\win64\pgo\m_lxe.dll+00436364
[ 89] 0x000000001c1f470a                            bin\win64\pgo\m_lxe.dll+01263370 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00381390
[ 90] 0x000000001c1263ab                            bin\win64\pgo\m_lxe.dll+00418731
[ 91] 0x000000001c1f455c                            bin\win64\pgo\m_lxe.dll+01262940 mwboost::archive::detail::iserializer<mwboost::archive::binaryTerm_iarchive,MathWorks::lxe::function_descriptor>::load_object_data+00380960
[ 92] 0x000000000b2f463b C:\Program Files\MATLAB\R2018b\toolbox\matlab\appdesigner\appdesigner\+appdesigner\+internal\+serialization\defer.mexw64+00149051
[ 93] 0x000000000b2d967d C:\Program Files\MATLAB\R2018b\toolbox\matlab\appdesigner\appdesigner\+appdesigner\+internal\+serialization\defer.mexw64+00038525
[ 94] 0x000000000b2ee8f4 C:\Program Files\MATLAB\R2018b\toolbox\matlab\appdesigner\appdesigner\+appdesigner\+internal\+serialization\defer.mexw64+00125172
[ 95] 0x00000000fd02cfee                                  bin\win64\iqm.dll+00643054 iqm::PackagedTaskPlugin::execute+00000894
[ 96] 0x00000000fd02ce63                                  bin\win64\iqm.dll+00642659 iqm::PackagedTaskPlugin::execute+00000499
[ 97] 0x000000001b1741fb                                  bin\win64\mcr.dll+00541179 mcrRegisterExternalFunction+00041003
[ 98] 0x00000000fcffcc07                                  bin\win64\iqm.dll+00445447 iqm::Iqm::setupIqmFcnPtrs+00076215
[ 99] 0x00000000fcffcc59                                  bin\win64\iqm.dll+00445529 iqm::Iqm::setupIqmFcnPtrs+00076297
[100] 0x00000000fcffca16                                  bin\win64\iqm.dll+00444950 iqm::Iqm::setupIqmFcnPtrs+00075718
[101] 0x00000000fcfd888d                                  bin\win64\iqm.dll+00297101 iqm::Iqm::deliver+00002109
[102] 0x00000000fb5fe634                          bin\win64\libmwbridge.dll+00058932 ioReadLine+00000772
[103] 0x00000000fb5fe3fd                          bin\win64\libmwbridge.dll+00058365 ioReadLine+00000205
[104] 0x00000000fb60fd4b                          bin\win64\libmwbridge.dll+00130379 mnDebugPrompt+00002155
[105] 0x00000000fb60f615                          bin\win64\libmwbridge.dll+00128533 mnDebugPrompt+00000309
[106] 0x00000000fb6100b4                          bin\win64\libmwbridge.dll+00131252 mnParser+00000580
[107] 0x000000001b143618                                  bin\win64\mcr.dll+00341528 mcr::runtime::setInterpreterThreadSingletonToCurrent+00020808
[108] 0x000000001b14414d                                  bin\win64\mcr.dll+00344397 mcr::runtime::setInterpreterThreadSingletonToCurrent+00023677
[109] 0x000000001b10b1ba                                  bin\win64\mcr.dll+00111034 mcrOptions::set_use_license_manager+00075498
[110] 0x000000001b126e74                                  bin\win64\mcr.dll+00224884 mcrOptions::set_use_license_manager+00189348
[111] 0x00000000fd02cfee                                  bin\win64\iqm.dll+00643054 iqm::PackagedTaskPlugin::execute+00000894
[112] 0x00000000fd02ce63                                  bin\win64\iqm.dll+00642659 iqm::PackagedTaskPlugin::execute+00000499
[113] 0x00000000fcffcc07                                  bin\win64\iqm.dll+00445447 iqm::Iqm::setupIqmFcnPtrs+00076215
[114] 0x00000000fcffcc59                                  bin\win64\iqm.dll+00445529 iqm::Iqm::setupIqmFcnPtrs+00076297
[115] 0x00000000fcffca16                                  bin\win64\iqm.dll+00444950 iqm::Iqm::setupIqmFcnPtrs+00075718
[116] 0x00000000fcfd9748                                  bin\win64\iqm.dll+00300872 iqm::Iqm::deliver+00005880
[117] 0x00000000fcfd8eef                                  bin\win64\iqm.dll+00298735 iqm::Iqm::deliver+00003743
[118] 0x00000000fcfdac0d                                  bin\win64\iqm.dll+00306189 iqm::Iqm::deliver+00011197
[119] 0x0000000100203775                        bin\win64\libmwservices.dll+02176885 services::system_events::PpeDispatchHook::dispatchOne+00036213
[120] 0x0000000100212a63                        bin\win64\libmwservices.dll+02239075 sysq::addProcessPendingEventsUnitTestHook+00006035
[121] 0x0000000100214310                        bin\win64\libmwservices.dll+02245392 sysq::getCondition+00004208
[122] 0x000000010021596d                        bin\win64\libmwservices.dll+02251117 svWS_ProcessPendingEvents+00000221
[123] 0x000000001b147724                                  bin\win64\mcr.dll+00358180 mcr::runtime::setInterpreterThreadSingletonToCurrent+00037460
[124] 0x000000001b147f16                                  bin\win64\mcr.dll+00360214 mcr::runtime::setInterpreterThreadSingletonToCurrent+00039494
[125] 0x000000001b13cabf                                  bin\win64\mcr.dll+00314047 mcr_process_events+00001007
[126] 0x000000001b04d040                             bin\win64\MVMLocal.dll+00380992 mvm_server::inproc::LocalFactory::terminate+00177312
[127] 0x00000000fa9d9480                                  bin\win64\mvm.dll+01741952 mvm::detail::SessionImpl::initWithOptions+00000592
```

## Specifications
  - MATLAB Release: R2018b
  - Operating System: Windows 10
  - `mlapptools` version 2018

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Error using mlapptools.getWebElements #25

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Error using mlapptools.getWebElements #25

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