OpenNos, Visual studio Problem

I know a lot of people had same problem, but I can't find a solution. In Visual Studio, at the command "update-database -Verbose" it show me a message: "No connection string named 'OpenNosContext' could be found in the application config file."
Can someone help me solving this problem?
Thank you.

Should be a notification at the flag at the top, download the latest update and your problem should be solved, it worked for me.

Thank u, solved. Can be closed