Getting Error on import motion *maya Rigging Tools

Hi

I am starting out using maya rigging tools today and it worked fine setting it up and getting the basic rig in the scene
but when i try importing animations this error pops up

Error: WindowsError: file D:/4.7/Engine/Extras/Maya_AnimationRiggingTools/MayaTools/General/Scripts\ART_importMotion.py line 557: 267

I have no idea why I tried looking around for solutions and cheked that the fbx plugin is loaded, and it is.