iOS Question FTP Error

I am trying to upload a file yo mu server.

But it gives me this error:

Cod_error: 0 - Error writing to stream: Error Domain=kCFErrorDomainCFNetwork Code=200 "(null)" UserInfo={kCFFTPStatusCodeKey=530, _kCFStreamErrorDomainKey=6, _kCFStreamErrorCodeKey=530}

Whats the meaning of the kCFFTPStatusCodeKey=530, _kCFStreamErrorDomainKey=6, _kCFStreamErrorCodeKey=530 ?

Thanks Erel