why getting "failed assertion in CG::StructType::isa(t)?

Getting Assertion error while simulating the model. Model using a Simulink Bus for structure.

Copying the full error message here,

failed assertion in b:\matlab\toolbox\stateflow\src\stateflow\cdr\cdr_transform_io_bus.cpp at line 459: CG::StructType::isa(t) [ 0] 0x00000001a2c27c74 C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02784372 SF::cdr_test_prop_flag+01280596 [ 1] 0x00000001a2c27a5f C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02783839 SF::cdr_test_prop_flag+01280063 [ 2] 0x00000001a2c27c74 C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02784372 SF::cdr_test_prop_flag+01280596 [ 3] 0x00000001a2c27a5f C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02783839 SF::cdr_test_prop_flag+01280063 [ 4] 0x00000001a2c27c74 C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02784372 SF::cdr_test_prop_flag+01280596 [ 5] 0x00000001a2c27a5f C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02783839 SF::cdr_test_prop_flag+01280063 [ 6] 0x00000001a2c27c74 C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02784372 SF::cdr_test_prop_flag+01280596 [ 7] 0x00000001a2c27a5f C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02783839 SF::cdr_test_prop_flag+01280063 [ 8] 0x00000001a2c27c74 C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02784372 SF::cdr_test_prop_flag+01280596 [ 9] 0x00000001a2c24f61 C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02772833 SF::cdr_test_prop_flag+01269057 [ 10] 0x00000001a2c24ce8 C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02772200 SF::cdr_test_prop_flag+01268424 [ 11] 0x00000001a2c2474c C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02770764 SF::cdr_test_prop_flag+01266988 [ 12] 0x00000001a2bd7f4b C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+02457419 SF::cdr_test_prop_flag+00953643 [ 13] 0x00000001a2a9002a C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+01114154 SF::StateflowTypeChecking::processFcn+00131514 [ 14] 0x00000001a2a95f4a C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+01138506 CGXE::JITMgr::JITMgr+00006522 [ 15] 0x00000001a2eb411e C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+05456158 SF::mx2str_write_str+00032974 [ 16] 0x00000001a2d5f395 C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+04060053 SF::sf_mexFunction+00001301 [ 17] 0x00000001a2d5ee92 C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+04058770 SF::sf_mexFunction+00000018 [ 18] 0x00000000fc5f7551 C:\Program Files\MATLAB\R2015b\bin\win64\libmex.dll+00095569 mexRunMexFile+00000129 [ 19] 0x00000000fc5f6872 C:\Program Files\MATLAB\R2015b\bin\win64\libmex.dll+00092274 inSwapMexfileReader+00000594 [ 20] 0x00000000fc5f6426 C:\Program Files\MATLAB\R2015b\bin\win64\libmex.dll+00091174 mexUnlock+00004998 [ 21] 0x0000000007a64cc3 C:\Program Files\MATLAB\R2015b\bin\win64\m_dispatcher.dll+00019651 Mfh_file::dispatch_fh_impl+00000531 [ 22] 0x0000000007a6488e C:\Program Files\MATLAB\R2015b\bin\win64\m_dispatcher.dll+00018574 Mfh_file::dispatch_fh+00000062 [ 23] 0x0000000007a651e8 C:\Program Files\MATLAB\R2015b\bin\win64\m_dispatcher.dll+00020968 Mfunction_handle::dispatch+00000968 [ 24] 0x0000000009127942 C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00162114 [ 25] 0x000000000915ab5f C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00371551 [ 26] 0x0000000009159810 C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00366608 [ 27] 0x00000000091896e1 C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00562913 [ 28] 0x0000000009189406 C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00562182 [ 29] 0x0000000009141916 C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00268566 [ 30] 0x000000000912a1ef C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00172527 [ 31] 0x00000000092b8048 C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+01802312 boost::archive::detail::oserializer<boost::archive::binaryTerm_oarchive,MathWorks::lxe::ClosedAbstractionFunctionDescriptor>::oserializer<boost::archive::binaryTerm_oarchive,MathWorks::lxe::ClosedAbstractionFunctionDescriptor>+00218984 [ 32] 0x0000000007a64cc3 C:\Program Files\MATLAB\R2015b\bin\win64\m_dispatcher.dll+00019651 Mfh_file::dispatch_fh_impl+00000531 [ 33] 0x0000000007a6483e C:\Program Files\MATLAB\R2015b\bin\win64\m_dispatcher.dll+00018494 Mfh_file::dispatch_fh_with_reuse+00000062 [ 34] 0x00000000098695f7 C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+07771639 boost::archive::detail::pointer_oserializer<boost::archive::binaryTerm_oarchive,MathWorks::lxe::MatlabIrTree>::save_object_ptr+01171895 [ 35] 0x000000000912a67b C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00173691 [ 36] 0x000000000912a5c5 C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00173509 [ 37] 0x0000000007b4432c C:\Program Files\MATLAB\R2015b\bin\win64\m_interpreter.dll+00017196 inCallFcn+00000060 [ 38] 0x00000001a2d5f20b C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+04059659 SF::sf_mexFunction+00000907 [ 39] 0x00000001a2eb411e C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+05456158 SF::mx2str_write_str+00032974 [ 40] 0x00000001a2d5f395 C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+04060053 SF::sf_mexFunction+00001301 [ 41] 0x00000001a2d5ee92 C:\Program Files\MATLAB\R2015b\bin\win64\stateflow.dll+04058770 SF::sf_mexFunction+00000018 [ 42] 0x00000000fc5f7551 C:\Program Files\MATLAB\R2015b\bin\win64\libmex.dll+00095569 mexRunMexFile+00000129 [ 43] 0x00000000fc5f6872 C:\Program Files\MATLAB\R2015b\bin\win64\libmex.dll+00092274 inSwapMexfileReader+00000594 [ 44] 0x00000000fc5f6426 C:\Program Files\MATLAB\R2015b\bin\win64\libmex.dll+00091174 mexUnlock+00004998 [ 45] 0x0000000007a64cc3 C:\Program Files\MATLAB\R2015b\bin\win64\m_dispatcher.dll+00019651 Mfh_file::dispatch_fh_impl+00000531 [ 46] 0x0000000007a6483e C:\Program Files\MATLAB\R2015b\bin\win64\m_dispatcher.dll+00018494 Mfh_file::dispatch_fh_with_reuse+00000062 [ 47] 0x0000000009247aed C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+01342189 MathWorks::lxe::ReleaseCurrentMcrContext+00448317 [ 48] 0x0000000009247a5d C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+01342045 MathWorks::lxe::ReleaseCurrentMcrContext+00448173 [ 49] 0x000000000912a67b C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00173691 [ 50] 0x000000000912a5c5 C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00173509 [ 51] 0x0000000007b4432c C:\Program Files\MATLAB\R2015b\bin\win64\m_interpreter.dll+00017196 inCallFcn+00000060 [ 52] 0x00000000747361cb C:\Program Files\MATLAB\R2015b\bin\win64\sl_services.dll+00418251 SlFeature::operator=+00001131 [ 53] 0x0000000074737ade C:\Program Files\MATLAB\R2015b\bin\win64\sl_services.dll+00424670 CMatlabCommand::execute+00000206 [ 54] 0x000000007473b4d4 C:\Program Files\MATLAB\R2015b\bin\win64\sl_services.dll+00439508 slsvFEVAL_NoThrow+00000100 [ 55] 0x000000013ec3d4cf C:\Program Files\MATLAB\R2015b\bin\win64\libmwsimulink.dll+13423823 StateflowRegisterOutputPortICParam+00000575 [ 56] 0x000000013e522252 C:\Program Files\MATLAB\R2015b\bin\win64\libmwsimulink.dll+05972562 sl::GlobalDataTransfer::setDefaultSyncTaskTransType+00272386 [ 57] 0x000000013e5f90a4 C:\Program Files\MATLAB\R2015b\bin\win64\libmwsimulink.dll+06852772 sl::MappingManager::getModelMappingsFor+00090836 [ 58] 0x000000013e5fc654 C:\Program Files\MATLAB\R2015b\bin\win64\libmwsimulink.dll+06866516 sl::MappingManager::getModelMappingsFor+00104580 [ 59] 0x000000013e5fe2fd C:\Program Files\MATLAB\R2015b\bin\win64\libmwsimulink.dll+06873853 sl::MappingManager::getModelMappingsFor+00111917 [ 60] 0x000000013ed3888a C:\Program Files\MATLAB\R2015b\bin\win64\libmwsimulink.dll+14452874 slmsg::QueueIntrfBase::getStorageReaderMessageMemoryPoolIndex+00101770 [ 61] 0x000000013ed3b888 C:\Program Files\MATLAB\R2015b\bin\win64\libmwsimulink.dll+14465160 slmsg::QueueIntrfBase::getStorageReaderMessageMemoryPoolIndex+00114056 [ 62] 0x000000013ed3ded0 C:\Program Files\MATLAB\R2015b\bin\win64\libmwsimulink.dll+14474960 slmsg::QueueIntrfBase::getStorageReaderMessageMemoryPoolIndex+00123856 [ 63] 0x000000013dfa2887 C:\Program Files\MATLAB\R2015b\bin\win64\libmwsimulink.dll+00206983 ExitPauseInDebuggerMenuSim+00002551 [ 64] 0x000000013e8da87e C:\Program Files\MATLAB\R2015b\bin\win64\libmwsimulink.dll+09873534 SLGlue::simulationStartPauseContinue+00000222 [ 65] 0x00000001a6a24849 C:\Program Files\MATLAB\R2015b\bin\win64\sl_mi.dll+00084041 SLM3I::mi::initCosSFBlockOpenNotification+00028681 [ 66] 0x000000000f86fbf6 C:\Program Files\MATLAB\R2015b\bin\win64\mcos_impl.dll+00130038 [ 67] 0x000000000f8716b6 C:\Program Files\MATLAB\R2015b\bin\win64\mcos_impl.dll+00136886 [ 68] 0x000000000f870495 C:\Program Files\MATLAB\R2015b\bin\win64\mcos_impl.dll+00132245 [ 69] 0x000000000f8979f6 C:\Program Files\MATLAB\R2015b\bin\win64\mcos_impl.dll+00293366 [ 70] 0x000000000f897811 C:\Program Files\MATLAB\R2015b\bin\win64\mcos_impl.dll+00292881 [ 71] 0x000000000f8976c0 C:\Program Files\MATLAB\R2015b\bin\win64\mcos_impl.dll+00292544 [ 72] 0x0000000007a65498 C:\Program Files\MATLAB\R2015b\bin\win64\m_dispatcher.dll+00021656 Mfh_MATLAB_fn::dispatch_fh+00000600 [ 73] 0x000000000f898ccd C:\Program Files\MATLAB\R2015b\bin\win64\mcos_impl.dll+00298189 [ 74] 0x0000000009247aed C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+01342189 MathWorks::lxe::ReleaseCurrentMcrContext+00448317 [ 75] 0x0000000009247a5d C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+01342045 MathWorks::lxe::ReleaseCurrentMcrContext+00448173 [ 76] 0x000000000915109f C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00331935 [ 77] 0x0000000180073821 C:\Program Files\MATLAB\R2015b\bin\win64\libmx.dll+00473121 matrix::detail::noninlined::mx_array_api::mxFevalFunctionHandle+00000033 [ 78] 0x00000000080cdcb2 C:\Program Files\MATLAB\R2015b\bin\win64\m_interpreter.dll+05823666 inFunctionHandleInterface::getWorkspaceObj+00576738 [ 79] 0x0000000007a656fe C:\Program Files\MATLAB\R2015b\bin\win64\m_dispatcher.dll+00022270 Mdispatcher::GetPushableExecutionStack+00000142 [ 80] 0x0000000007a65498 C:\Program Files\MATLAB\R2015b\bin\win64\m_dispatcher.dll+00021656 Mfh_MATLAB_fn::dispatch_fh+00000600 [ 81] 0x0000000009247aed C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+01342189 MathWorks::lxe::ReleaseCurrentMcrContext+00448317 [ 82] 0x0000000009247a5d C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+01342045 MathWorks::lxe::ReleaseCurrentMcrContext+00448173 [ 83] 0x000000000912a67b C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00173691 [ 84] 0x000000000912a5c5 C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00173509 [ 85] 0x0000000007b4432c C:\Program Files\MATLAB\R2015b\bin\win64\m_interpreter.dll+00017196 inCallFcn+00000060 [ 86] 0x0000000009177b4e C:\Program Files\MATLAB\R2015b\bin\win64\m_lxe.dll+00490318 [ 87] 0x0000000007b6d4d1 C:\Program Files\MATLAB\R2015b\bin\win64\m_interpreter.dll+00185553 inCallFcnWithTrap+00000081 [ 88] 0x00000000fc893cab C:\Program Files\MATLAB\R2015b\bin\win64\dastudio.dll+02571435 SafeCallMatlab+00000187 [ 89] 0x00000000fc8883f5 C:\Program Files\MATLAB\R2015b\bin\win64\dastudio.dll+02524149 ActionSchema::invokeCallback+00000117 [ 90] 0x00000000fc88f6cb C:\Program Files\MATLAB\R2015b\bin\win64\dastudio.dll+02553547 DigCallbackInvoker::invokeUDI+00000187 [ 91] 0x00000000fc88f5ea C:\Program Files\MATLAB\R2015b\bin\win64\dastudio.dll+02553322 DigDefaultCallbackInvoker::invoke+00000058 [ 92] 0x00000000fc905b7d C:\Program Files\MATLAB\R2015b\bin\win64\dastudio.dll+03038077 DeferredManager::get_instance+00000141 [ 93] 0x00000000fab62aa6 C:\Program Files\MATLAB\R2015b\bin\win64\uiw.dll+00535206 UIW_AttachThreadInput+00001270 [ 94] 0x00000000fab62335 C:\Program Files\MATLAB\R2015b\bin\win64\uiw.dll+00533301 wsd_to_MSW+00004181 [ 95] 0x00000000fab623b9 C:\Program Files\MATLAB\R2015b\bin\win64\uiw.dll+00533433 wsd_to_MSW+00004313 [ 96] 0x0000000076ca87fe C:\WINDOWS\system32\USER32.dll+00165886 GetMenuBarInfo+00000638 [ 97] 0x0000000076c8f5fb C:\WINDOWS\system32\USER32.dll+00062971 SystemParametersInfoW+00000235 [ 98] 0x0000000076c94895 C:\WINDOWS\system32\USER32.dll+00084117 IsProcessDPIAware+00000465 [ 99] 0x0000000076dcd8f5 C:\WINDOWS\SYSTEM32\ntdll.dll+00317685 KiUserCallbackDispatcher+00000031 [100] 0x0000000076c99e6a C:\WINDOWS\system32\USER32.dll+00106090 SfmDxSetSwapChainStats+00000026 [101] 0x0000000076c9615e C:\WINDOWS\system32\USER32.dll+00090462 GetMessageA+00000078 [102] 0x00000000fab0e5b8 C:\Program Files\MATLAB\R2015b\bin\win64\uiw.dll+00189880 UIW_ShowMenuItem+00006552 [103] 0x00000000090b94ac C:\Program Files\MATLAB\R2015b\bin\win64\libmwbridge.dll+00038060 ioReadLine+00004060 [104] 0x00000000090b86b4 C:\Program Files\MATLAB\R2015b\bin\win64\libmwbridge.dll+00034484 ioReadLine+00000484 [105] 0x00000000090b83f2 C:\Program Files\MATLAB\R2015b\bin\win64\libmwbridge.dll+00033778 ioCmdLineEditSave+00011986 [106] 0x00000000090b84bb C:\Program Files\MATLAB\R2015b\bin\win64\libmwbridge.dll+00033979 ioReadLine+00000107 [107] 0x00000000090c3095 C:\Program Files\MATLAB\R2015b\bin\win64\libmwbridge.dll+00077973 mnDebugPrompt+00001509 [108] 0x00000000090c2bca C:\Program Files\MATLAB\R2015b\bin\win64\libmwbridge.dll+00076746 mnDebugPrompt+00000282 [109] 0x00000000090c32eb C:\Program Files\MATLAB\R2015b\bin\win64\libmwbridge.dll+00078571 mnParser+00000395 [110] 0x00000000090187a4 C:\Program Files\MATLAB\R2015b\bin\win64\mcr.dll+00362404 mcrInstance::mnParser_on_interpreter_thread+00000036 [111] 0x0000000008fec477 C:\Program Files\MATLAB\R2015b\bin\win64\mcr.dll+00181367 mcr::runtime::setInterpreterThreadToCurrent+00019751 [112] 0x0000000008fec4b3 C:\Program Files\MATLAB\R2015b\bin\win64\mcr.dll+00181427 mcr::runtime::setInterpreterThreadToCurrent+00019811 [113] 0x0000000008feccb1 C:\Program Files\MATLAB\R2015b\bin\win64\mcr.dll+00183473 mcr::runtime::setInterpreterThreadToCurrent+00021857 [114] 0x00000000fab62aa6 C:\Program Files\MATLAB\R2015b\bin\win64\uiw.dll+00535206 UIW_AttachThreadInput+00001270 [115] 0x00000000fab62335 C:\Program Files\MATLAB\R2015b\bin\win64\uiw.dll+00533301 wsd_to_MSW+00004181 [116] 0x00000000fab623b9 C:\Program Files\MATLAB\R2015b\bin\win64\uiw.dll+00533433 wsd_to_MSW+00004313 [117] 0x0000000076ca87fe C:\WINDOWS\system32\USER32.dll+00165886 GetMenuBarInfo+00000638 [118] 0x0000000076c8f5fb C:\WINDOWS\system32\USER32.dll+00062971 SystemParametersInfoW+00000235 [119] 0x0000000076c94895 C:\WINDOWS\system32\USER32.dll+00084117 IsProcessDPIAware+00000465 [120] 0x0000000076dcd8f5 C:\WINDOWS\SYSTEM32\ntdll.dll+00317685 KiUserCallbackDispatcher+00000031 [121] 0x0000000076c9908a C:\WINDOWS\system32\USER32.dll+00102538 PeekMessageW+00000186 [122] 0x0000000076c950fe C:\WINDOWS\system32\USER32.dll+00086270 GetKeyState+00000238 [123] 0x0000000076c93a6f C:\WINDOWS\system32\USER32.dll+00080495 PeekMessageA+00000087 [124] 0x00000000fab0e1cb C:\Program Files\MATLAB\R2015b\bin\win64\uiw.dll+00188875 UIW_ShowMenuItem+00005547 [125] 0x00000000fab634c2 C:\Program Files\MATLAB\R2015b\bin\win64\uiw.dll+00537794 UIW_SuspendAttachThreadInput+00000690 [126] 0x0000000004520ad3 C:\Program Files\MATLAB\R2015b\bin\win64\libmwservices.dll+01510099 services::system_events::PpeDispatchHook::dispatchOne+00032291 [127] 0x000000000452c785 C:\Program Files\MATLAB\R2015b\bin\win64\libmwservices.dll+01558405 sysq::addProcessPendingEventsUnitTestHook+00006101 MATLAB stack trace: > In construct_module (line 99) In generate_code_for_charts_and_machine (line 145) In sfc (line 166) In targetman>code_method (line 371) In targetman>method_nag_wrapper (line 154) In targetman (line 83) In autobuild_kernel>autobuild_local (line 195) In autobuild_kernel (line 57) In autobuild_driver (line 116) In slsf (line 116) CG::StructType::isa(t) Component: Stateflow | Category: Assertion error CG::StructType::isa(t) Component: Simulink | Category: Model error