Authentication fails



I am using “MGTwitterEngine demo project for iPhone” from Github. I am not able to verify my login credential with Twitter API. The response I am getting as “Oops!, Your username and password could not be verified. Double check that you entered them correctly and try again.” But I am able to login on Twitter web with the same credentials. I have included the consumer key and consumer secret in the application. Couldn’t be able to identify the issue in my application. Is there any toubleshooting to identify the issue. It’s very urgent, can anybody help me to solve it out.

Thanks and regards,