NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@/browse/authentication/#", address]];

RKRequest *request = [RKRequest requestWithURL:url delegate:self];
request.forceBasicAuthentication = YES;
request.username = [loginField text];
request.password = [passwordField text];
[request send];

[RKRequest setForceBasicAuthentication:]: unrecognized selector sent to instance 0x348420
 *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[RKRequest setForceBasicAuthentication:]: unrecognized selector sent to instance 0x348420'