TeamMate Database has an invalid connection configuration

I would like to say that in my company going to familiarization to TeamMate Audit Sofware. It has been already configured with SQL Server Management studio 2012. Due to some mistake one of the "Audit Team User" deleted from the database. After consult with TeamMate technical team they have suggested to us. To "restore" the "TeamMate Samaple Database" in you SQL Server 2012 then your user will be able to login.

I have done successfully restore the TeamMate SampleDB in my SQL Server . After restoration when my company Audit team try to restore TeamMate SampleDB through "TeamAdmin" software then getting such as a Error: This database has an invalid connection configuration.Check the connection file or select another connection.

kindly look the issue and give me some suggestion . because it's urgent for my Company Audit Team.