Cause
In the BananaApp is missing the method 'exec(string)' . The method 'exec(string)' is the entry point of a BananaApp, it is called when a BananaApp is run.
Solution
- Update the BananaApp or script;
- Update Banana Accounting;
- Contact the author of the script or BananaApp;
- See the BananaApps Documentation.