It appears that your Twitter account needs to be reauthorized in Sprout. Please click on the red triangle in the upper left hand corner of your Sprout Social group. If you do not see the red triangle, please contact firstname.lastname@example.org or go to Users & Groups under the gear icon in the right hand corner and click on "connect a profile". Make sure you are logged into the Twitter account that needs to be reauthorized and go through the steps of reauthorizing on Twitter.com. Let us know if you have any trouble!
Sprout Essentials Guide