Unable to import project - Polygon to UE 4.24

[vrpixel]

Assertion failed: rootComponent [File:D:/UE4/CODE424/Plugins/ExodusImport/Source/ExodusImport/Private/builders/GeometryComponentBuilder.cpp] [Line: 186]

UE4Editor_Core
UE4Editor_Core
UE4Editor_ExodusImport!GeometryComponentBuilder::processMeshAndColliders() [d:\ue4\code424\plugins\exodusimport\source\exodusimport\private\builders\geometrycomponentbuilder.cpp:186]
UE4Editor_ExodusImport!JsonImporter::importObject() [d:\ue4\code424\plugins\exodusimport\source\exodusimport\private\jsonimporter\object.cpp:134]
UE4Editor_ExodusImport!JsonImporter::loadObjects() [d:\ue4\code424\plugins\exodusimport\source\exodusimport\private\jsonimporter.cpp:148]
UE4Editor_ExodusImport!JsonImporter::importScene() [d:\ue4\code424\plugins\exodusimport\source\exodusimport\private\jsonimporter\scene.cpp:72]
UE4Editor_ExodusImport!JsonImporter::importProject() [d:\ue4\code424\plugins\exodusimport\source\exodusimport\private\jsonimporter\scene.cpp:178]
UE4Editor_ExodusImport!FJsonImportModule::PluginImportButtonClicked() [d:\ue4\code424\plugins\exodusimport\source\exodusimport\private\jsonimport.cpp:145]
UE4Editor_ExodusImport!TBaseRawMethodDelegateInstance<0,FJsonImportModule,void __cdecl(void)>::ExecuteIfSafe() [c:\uengine\ue_4.24\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:541]
UE4Editor_Slate
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
user32
user32
UE4Editor_ApplicationCore
kernel32
ntdll