importing "ProductModuleName-Swift.h" error

Hi,
In my objectiveC project ,i tried to use swift.
so I added a swift file in my objectiveC project.
accepted to add bridging file.
Once i use "#import "ProductModuleName-Swift.h" in objectiveC file, and build the project, i am getting error "#pragma clang attribute pop' with no matching '#pragma clang attribute push'".
Why this error?
How to fix?