Having the same issue.
Pixate Studio Version 2.0.1 (build-552fd0a0-4)Xcode Version 8.0 (8A218a)
Xcode is located in Macintosh HD > Applications > Xcode
Already tried reinstalling Pixate. Didn't help.
I got around the issue by downgrading to xcode 7.3.1 (the last version of xcode before 8) and it worked for me.