Hey Nando73,
Are you still having issues?
Just fyi, long file paths may cause file path issues. Your file path is slightly different from what I expected (C:\…\ConanSandbox…).
I have moved this thread to the Conan Exiles bugs subforum, as it provides a bug report for Conan Exiles. Your thread will be seen regardless.
You can find the [PC] Conan Exiles Bug Report Guidelines 
pinned at the top of this subforum.