After installing blue express i enable Blue express in extension enabler on both host and agent.I was able to invoke blue express and connect to my mainframe box using silk.For this purpose the objects present in file was sufficient.When i got into mainframe box and tried to identify the objects in the screen i was able to recognize all the objects.But when i scripted using those objects it gave error saying "[ChildWin] cannot be recognized".When i tried to record the testcase, it made some entry on file and some entry on the frame file which i had recorded.When i tried to play back the recorded script again i got the "[ChildWin] cannot be recognized" error.Can anyone throw some light on this.