You could try delete setting file see if it works, as this worked for others. Try deleting the Model.bim_username.settings or .layout file. Notice they might be hidden in the project folder. The method was mention in this thread.
Troubleshooting this kind of message could be quite hard. You could try search through the code see if there is "311" string exists. And try deal with it.(Backup well before the operation!)
Last choice is to reconstruct and deploy the project, that we are trying to avoid.