I cannot tweet…anyone can help me?

Posted on Jan 16, 2012 in Hiroko's Blog

I began my tweet at the end of last year. Dear Meaghan Dillon kindly helped me to establish my twitter account. Since then, I have been (not all the time, though) enjoying to tweet. Suddenly yesterday my Timeline stopped refreshing and I cannot tweet. Error message appears: There was an error posting your tweet. It has been saved as a draft, please try resending later. (Error: unauthorized)

I appreciate any of your advice!
Hiroko