can not create a testComplete object

I am using visual studio 12,  with C#

 exception. System.NullReferenceException: System.NullReferenceException: Object reference not set to an instance of an object..

System.Exception: Can not create TestComplete object.
at AutomatedQA.script.var.GetObjectAlternative(String Name, String AlternativeName)
at AutomatedQA.TestComplete.Connect.TBaseTCClass.GetTestCompleteIntegration()
at AutomatedQA.TestComplete.Connect.IntegrationClass.Init()
at AutomatedQA.script.var.get_Item(String name, var[] args)
at AutomatedQA.TestComplete.Connect.RunTest(String LogName, String ProjectName, String SuiteName)

I tried the solution to modify the troubleshooting compatibility of devenv.exe and that did not work