Unreal crashes when exporting a character

[cucsijuan]

I was exporting a single character, unity exported it succesfully but when importing it to UE4, it fails on exporting meshes, i was exporting a character asset made by POLYGON (Sci-Fi space Pack specifically)

this is the assert that failed: Assertion failed: FindRawBoneIndex(BoneInfo.Name) == INDEX_NONE [File:D:\Build++UE4\Sync\Engine\Source\Runtime\Engine\Public\ReferenceSkeleton.h] [Line: 188]

CallStack:

UE4Editor_Core UE4Editor_Core UE4Editor_Core UE4Editor_Core UE4Editor_Engine UE4Editor_ExodusImport!SkeletalMeshBuilder::setupReferenceSkeleton() [c:\users\ngd_8700_05\documents\unreal projects\psyfispace\plugins\exodusimport\source\exodusimport\private\meshbuilder\skeletalmeshbuilder.cpp:89] UE4Editor_ExodusImport!SkeletalMeshBuilder::setupSkeletalMesh() [c:\users\ngd_8700_05\documents\unreal projects\psyfispace\plugins\exodusimport\source\exodusimport\private\meshbuilder\skeletalmeshbuilder.cpp:584] UE4Editor_ExodusImport!std::_Func_impl_no_alloc<<lambda_339e10e87363c2f3657a2fa34ba0552d>,void,USkeletalMesh *>::_Do_call() [c:\program files (x86)\microsoft visual studio\2017\community\vc\tools\msvc\14.16.27023\include\functional:15732480] UE4Editor_ExodusImport!<lambda_3c5cfe7ee3cb3db104ce1009c30784fa>::operator()() [c:\users\ngd_8700_05\documents\unreal projects\psyfispace\plugins\exodusimport\source\exodusimport\private\unrealutilities.h:147] UE4Editor_ExodusImport!UnrealUtilities::createAssetPackage() [c:\users\ngd_8700_05\documents\unreal projects\psyfispace\plugins\exodusimport\source\exodusimport\private\unrealutilities.cpp:20] UE4Editor_ExodusImport!UnrealUtilities::createAssetObject<USkeletalMesh>() [c:\users\ngd_8700_05\documents\unreal projects\psyfispace\plugins\exodusimport\source\exodusimport\private\unrealutilities.h:152] UE4Editor_ExodusImport!JsonImporter::importSkeletalMesh() [c:\users\ngd_8700_05\documents\unreal projects\psyfispace\plugins\exodusimport\source\exodusimport\private\jsonimporter\mesh.cpp:100] UE4Editor_ExodusImport!JsonImporter::importMesh() [c:\users\ngd_8700_05\documents\unreal projects\psyfispace\plugins\exodusimport\source\exodusimport\private\jsonimporter\mesh.cpp:124] UE4Editor_ExodusImport!JsonImporter::loadMeshes() [c:\users\ngd_8700_05\documents\unreal projects\psyfispace\plugins\exodusimport\source\exodusimport\private\jsonimporter.cpp:137] UE4Editor_ExodusImport!JsonImporter::importProject() [c:\users\ngd_8700_05\documents\unreal projects\psyfispace\plugins\exodusimport\source\exodusimport\private\jsonimporter\scene.cpp:150] UE4Editor_ExodusImport!FJsonImportModule::PluginImportButtonClicked() [c:\users\ngd_8700_05\documents\unreal projects\psyfispace\plugins\exodusimport\source\exodusimport\private\jsonimport.cpp:145] UE4Editor_ExodusImport!TBaseRawMethodDelegateInstance<0,FJsonImportModule,void __cdecl(void)>::ExecuteIfSafe() [d:\epic\ue_4.22\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:518] UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_ApplicationCore UE4Editor_ApplicationCore UE4Editor_ApplicationCore UE4Editor_ApplicationCore user32 user32 UE4Editor_ApplicationCore UE4Editor UE4Editor UE4Editor UE4Editor UE4Editor kernel32 ntdll