I follow the instruction and this is what I get when i try to build rig:
Could not save file: C:/Program Files/Unreal Engine/4.0/Engine/Extras/Maya_AnimationRiggingTools/MayaTools/General/ART/Projects/Sample/ExportFiles/d_Export.mb not a valid file.
File may exist already and be marked as read only. Aborting operation.
It says D:/ in FillisterDock??!! Ive tried everything, followed the tutorials over and over again. What am I doing wrong. Could someone tell how they get it working???