I'm having this same problem. I installed GuideGuide to CC. Updated to CC 2014 and removed CC from my computer. I then tried to install GuideGuide to CC 2014 and I get the above error. Cannot find any remnant files to GuideGuide anywhere.. no other way to uninstall it. Not sure if this is an Adobe Extension issue or a GuideGuide issue.
Extension Manger CC 7.1 version works as expected i believe , I have been trying with 7.2 and above results with all this kind of issues and errors .
Please let me know , Does Extension Manger CC 7.1 supports installing plugins with new release InDesign CC 2014 (version 10) ?