Has anyone successfully used MPOAuth on iPhone to connect with twitter?

Question

My project builds fine but when it gets to line pasted bellow it crashes with the following message.

CODE:

oauthAPI = [[MPOAuthAPI alloc] initWithCredentials:credentials
        authenticationURL:[NSURL URLWithString:@"https://twitter.com/oauth/"]
         andBaseURL:[NSURL URLWithString:@"https://twitter.com/"]];

ERROR:

Assertion failure in -[MPOAuthAuthenticationMethodOAuth initWithAPI:forURL:withConfiguration:], /Project/MPOAuth/MPOAuthAuthenticationMethodOAuth.m:49

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Incorrect number of oauth authorization methods'