A Fatal Error Has Occurred Loading The Metadata For Mscorlib Dll !free! -

rm -rf ~/.mono/metadata

# Linux/macOS with Mono pedump --metadata /path/to/mscorlib.dll | head -20 rm -rf ~/

When Mono’s mono_image_open_from_data_with_name() function tries to read the PE/COFF structure of mscorlib.dll : rm -rf ~/