Cant add delete or add directories

Three things to try

  1. Restart the server.

  2. Check for database corruption. See this post for info.

  3. If the database is OK, then a) make sure your system is set for debug logging, b) re-create the problem so it will be captured by the logs, c) download & post the .zip file with the logs. See Reporting Issues with Plex Media Server for info on logging levels and retrieving log files.