Error while copying folders/files from Google Drive to OneDrive

I am getting error while copying folder from Google Drive to OneDrive and Error message is only showing:  Conversion : 'D' . When I copy only files it works, but while copying folder I am getting this error. Also if I deselect 'Include Versioning'  option then some folders/files are copied but with errors in logs as  "Failure to Create Folder: Migration testing of dept data: The server sent HTTP status code 503: Service Unavailable

Has anyone faced similar issue before? Would really appreciate quick response.