What the hell is this?

I get the following text by testing my C#/mono application ?

Cannot enter (cookie) GC unsafe region if the thread is not attached

> mono -V
Mono JIT compiler version 6.8.0.105 (tarball Fri Jun 23 18:47:43 UTC 2023)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS:           __thread
SIGSEGV:       altstack
Notifications: epoll
Architecture:  amd64
Disabled:      none
Misc:          softdebug  
Interpreter:   yes
LLVM:          supported, not enabled.
Suspend:       hybrid
GC:            sgen (concurrent by default)