New error a few minutes later! Same actions.
MachineId:5EC548EE4D5D55BBAD00FDA818B6329C
EpicAccountId:0d22223890c14e53a7b95ab62128b47c
Unknown exception - code 00000001 (first/second chance not available)
"Assertion failed: NumJobs == QueuedJobs.Num() [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.9\Engine\Source\Runtime\Engine\Private\ShaderCompiler\ShaderCompiler.cpp] [Line
UE4Editor_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\core\private\misc\outputdevice.cpp:354]
UE4Editor_Engine!DoReadTaskResults() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\shadercompiler\shadercompiler.cpp:249]
UE4Editor_Engine!FShaderCompileThreadRunnable::ReadAvailableResults() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\shadercompiler\shadercompiler.cpp:662]
UE4Editor_Engine!FShaderCompileThreadRunnable::CompilingLoop() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\shadercompiler\shadercompiler.cpp:772]
UE4Editor_Engine!FShaderCompileThreadRunnableBase::Run() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\shadercompiler\shadercompiler.cpp:357]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:74]