The server received a command from the client that was missing one or more parameters.
command is the command that was missing the expected parameters.
The server rejects command command. FTP continues processing.
Report the error to the FTP client system programmer.
If the faulty command was generated as a result of incorrect parameters specified by the user, have the user execute the command again using correct parameters. If the faulty command was generated by the client software, report the error to the provider of the client software.