The model backing the ‘CloudPanelContext’ context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269).
This error message is telling you that your database is not up to date and it needs to be updated. With each upgrade of CloudPanel there may be changes to the database that need to be made.
Each time that CloudPanel is started (the Application Pool in IIS), CloudPanel checks if an update needs to be made to the database. If you receive the this error, try recycling the CloudPanel application pool in IIS. If the error continues, then something is wrong with the database and you must contact support.