line 14647:
cmds.file(save = True, type = "mayaBinary", force = True, prompt = True)
line 14829 :
cmds.file(save = True, type = "mayaBinary", force = True, prompt = True)
line 14955 :
cmds.file(save = True, type = "mayaBinary", force = True, prompt = True)
line 14987 :
cmds.file(save = True, type = "mayaBinary", force = True, prompt = True)
you must to set prompt=true, because of the warning message that saving process in maya occurs with student edition !
For the one who don’t want to edit the file themselves : you can download the file here and extract the file into your this directory : “Engine\Extras\Maya_AnimationRiggingTools\MayaTools\General\Scripts”
Hot Fix : http://puppet-master.net/UnrealEngine4/Maya/ART/ART_skeletonBuilder_UI.rar