Error while making automator service to archive files with tar

I wrote an automator service to be create tar archives using the tar command, due to this format being more efficient than the .zip that the "Compress" option in the finder menu gives me. However on running the service it just gives me this error, regardless of the type of file used: This is the source of the service: (Using a slightly modified version of [https://stackoverflow.com/questions/35138806/automator-action-shell-script-to-tar-multiple-files-folders-containing-spaces](https://stackoverflow.com/questions/35138806/automator-action-shell-script-to-tar-multiple-files-folders-containing-spaces))