You must set myJID before calling connect error

You must set myJID before calling connect error

I want to implement 'OpenFire' server for chat application. I got source
code on git at https://github.com/rayaleen/OpenFireClient. On login button
action it shows me following error:
Error connecting: Error Domain=XMPPStreamErrorDomain Code=2 "You must set
myJID before calling connect." UserInfo=0x7a87c80
{NSLocalizedDescription=You must set myJID before calling connect.}
But I could not find any document to implement this. Does any one have any
idea about this type of error? Any link for documentation would be more
helpful.