What is causing this build error from source: Build.bat -Target="ShaderCompileWorker" -WaitMutex -FromMsBuild" exited with code 6

Development Programming & Scripting C++
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Same issue, can’t use C++ at all in Unreal Engine 4.26.1. I don’t have the issue in 4.25.4.

C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Microsoft\VC\v160\Microsoft.MakeFile.Targets(44,5): error MSB3073: The command ““C:\Program Files\Epic Games\UE_4.26\Engine\Build\BatchFiles\Build.bat” ToonTanksEditor Win64 Development -Project=“C:\Users\Documents\Unreal Projects\ToonTanks 4.26\ToonTanks.uproject” -WaitMutex -FromMsBuild” exited with code 6.