If the file on the server already exists and the Overwrite property is set to False (default), you may encounter this error. To resolve this either set the RemoteFile property to a different value, or set the Overwrite property to true.

If you are uploading the file to a full disk.

If you have exceeded a user disk quota.

If you are moving the file to a different disk on the server.

If none of these potential causes are the case you should double check that you have the appropriate permissions to perform the current action or contact the server administrator.