M2u interactive sync script for Maya -> UE4

Heya, thanks for this script. On attempting to run ‘send selected to editor’ in maya I am getting the error:

m2u.maya.mayaCommand : settings file path is: D:\VIRT\m2u\ue4\ue4FBXSettings.fbxexportpreset

// Error: Bad file extension. (must be: fbxexportpreset) //

Complaining about the file extension, but also printing the correct file extension and path. Why would this be happening?

Thanks!