Demo upload create gives error

[Patrickyp]

Getting the following error when trying to call testCreate() on the Demo program.

Create directory with result:
false, error: Optional(Error Domain=kCFErrorDomainCFNetwork Code=200 "(null)" UserInfo={kCFFTPStatusCodeKey=550, _kCFStreamErrorCodeKey=550, _kCFStreamErrorDomainKey=6})

What does this error mean and how to fix?