Database Boiler plate Course strucking on lunaching.... screen after completeing the courese

Database Boiler plate Course struck on launching… screen after completing the course. When I completed the course and pressed continuously. it gives congratulation but the ticked mark won’t show. I launch the course again it show the continue button again but the tick mark was not showing I try again then it stuck on launching. what should I do please guide me.
I try to logout and login my account. i try to run other course and run this course again but no progress