Error reading Maya file

I was trying to import a camera into AE, but I encounted the error: AEGP Plugin MayaImport: Error reading Maya file. (5027::12)

Here's how I did:

Version of softwares:

Maya 2014 and 2013

After Effects CS6

System:

Windows 7 & Mac OS 10.6.8

I exported Camera and locator from a maya(.mb) file and save it as a .ma file. I baked all keyables of the camera.

Then I tried to import it into AE. and the error occured.

I tried different versions of maya and different systems, as I mentioned above. But the results were the same.

Does anybody know how to fix it? Or show me another way to import Maya's camera into AE?

Thanks!