Boost::Filesystem::Create_directory:Can not create a file when the file already exists:
“C:\Users\Galle\onedrive\documents\”
This seems to be a Microsoft OneDrive issue, so for now, don't create DCP-o-matic projects within a OneDrive folder. Create projects/DCPs in a different directory, and if for some reason you want them to be synced with OneDrive, copy/move them to OneDrive later after finishing.