Error message

• Notice: Undefined index: username in socialmedia_twitter_tokens() (line 612 of /home/lecturer/public_html/chrdri.net/sites/all/modules/socialmedia/socialmedia.platforms.inc).
• Notice: Undefined index: username in socialmedia_twitter_tokens() (line 612 of /home/lecturer/public_html/chrdri.net/sites/all/modules/socialmedia/socialmedia.platforms.inc).