500 oops：unrecognise option： -t

This error message usually appears when using the FTP client and trying to use an unrecognized option with the command. In this case, the option "-t" is not recognized by the FTP client.

To resolve this issue, you should review the command you are trying to use and check for any typos or errors. If you are unsure about the correct syntax for the command, you can refer to the FTP client's documentation or seek assistance from the support team.

Alternatively, you can try using a different FTP client that supports the option you need to use. Some popular FTP clients include FileZilla, Cyberduck, and WinSCP.