Emoncms Apps: Call to a member function fetch_object() on a non-object?

Hello my name is Gerardo and I’m from italy, i have a problem with app, i have installed app on my emoncms version 9.31 on linux shared server, i am from the following error:

Fatal error: Call to a member function fetch_object() on a non-object in /web/htdocs/www.xxxxxxxxx.xxx/home/emoncms/Modules/app/AppConfig_model.php on line 167

What can I do to work?

Thank you

Hello Gerardo, I think you might need to run the emoncms database update via Setup > Administration > Update & Check