Hi , Thank you for your reply. But i'm trying to build few files in a new solution. The problem is that i have added these files in a new solution and on trying to build it, iam getting these errors. Though what i found is that few of these files have ATl dependency. But i was not able to find out what is causing this error. Actually this error is coming on compilation of a file, which on checking out i found that it has no dependecy with ATL. You can find few more description:

1) The project is in QT
2) I am trying to put certain files which actually has ATl dependency into a new solution.