Not signed in
Copyright © 2026 Unity Technologies
The Import Worker crashes happen rarely on creating new projects through HUB. There is a special logic which automatically upgrades Collab-proxy package version on project opening, it does that in a wrong time and as result sometimes Import Workers crash. The Compilation pipeline in Workers is reading .asmdef file while it is being upgraded, that happens with these two files:
Unity.CollabProxy.Editor.asmdef
Unity.PlasticSCM.Editor.Entities.asmdef
Steps to reproduce:
1. Simply create new project through HUB from any template. But it happens really rarely
Reproducible with versions: 6000.0.57f1, 6000.2.3f1, 6000.3.0b1
Reproducible on: macOS, Windows 10, Windows 11
Not reproducible on: no other environment tested
Note: "Fatal Error! Compilation Pipeline: Could not read file" Error is printed before AssetImportWorker crashes
StackTrace:
The AssetImportWorker1 has crashed. Please report a bug with the following Stack Trace: ========== OUTPUTTING STACK TRACE ==================0x00007FFB206FB699 (KERNELBASE) RaiseException 0x00007FFA5C5FA3B9 (Unity) EditorMonoConsole::LogToConsoleImplementation 0x00007FFA5C5FB0A0 (Unity) EditorMonoConsole::LogToConsoleImplementation 0x00007FFA5D2A7DDD (Unity) DebugStringToFilePostprocessedStacktrace 0x00007FFA5D2A7159 (Unity) DebugStringToFile 0x00007FFA5CB88065 (Unity) RegisterAssemblyDefinition 0x00007FFA5CFAAFD5 (Unity) ProcessAssemblyAssets 0x00007FFA5CFABD36 (Unity) UpdateScriptCompilationPipelineCaches 0x00007FFA5CEC3964 (Unity) AssetImportWorkerClient::RegisterTransientArtifacts 0x00007FFA5CEC3BE2 (Unity) AssetImportWorkerClient::ReloadScriptingDomain 0x00007FFA5CE9EAF0 (Unity) <lambda_dfe2fdae22f1629f164682966ac9a93e>::operator() 0x00007FFA5CF7F99F (Unity) asio::detail::completion_handler<core::mutable_function<void __cdecl(void)>,asio::io_context::basic_executor_type<std::allocator<void>,0> >::do_complete 0x00007FFA5CF6D161 (Unity) asio::detail::win_iocp_io_context::do_one 0x00007FFA5CF6E46E (Unity) asio::detail::win_iocp_io_context::run 0x00007FFA5CF7E009 (Unity) IOService::Run 0x00007FFA5CEC7B35 (Unity) RunAssetImportWorkerClientV2 0x00007FFA5CEC7BFB (Unity) RunAssetImporterV2 0x00007FFA5C6F9AA0 (Unity) Application::InitializeProject 0x00007FFA5CCDD465 (Unity) UnityMain 0x00007FF71B6A2F2A (Unity) __scrt_common_main_seh 0x00007FFB21517374 (KERNEL32) BaseThreadInitThunk 0x00007FFB22F5CC91 (ntdll) RtlUserThreadStart========== END OF STACKTRACE =========== -- for more information, check Logs/AssetImportWorker1.log
Sign in to see your voted issues