Fatal error: Uncaught Error: Call to a member function Close() on bool. Scriptcase not loading

From one day to another, when trying to open the development environment, we get this error:

" Fatal error : Uncaught Error: Call to a member function Close() on bool"
/home/n97eed5/scritcase.aliar.com.co/wwwroot/scriptcase/devel/class/interface/nmUser.class.php on line 1096

And then it won’t open…

Any ideas??