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Why the widget is showing me black screen?

There are a few possibilities for this question: 1. Your Twitter username is incorrect. Please check and enter your Twitter username correctly. 2. Twitter is down. You can verify this by checking Twitter website (http://www.twitter.com).

Why it is showing me invalid username in the option page of the administrative screen?

Please check and enter your Twitter username carefully. Once it is successfully verified with Twitter account, this error message will not be shown.