No "error" as such, the outline/image of the app simply shows as "greyed out", rendering it quite useless. I've launched from terminal before to check also, and no "error" appeared, but things just "failed" (by which I mean were all grey and useless).
As for other apps, I've used Tucan, and some others (can't recall the names right now, not at the main machine), which are ok, but no where near as versatile and usable as this one (when it's co-operating and working properly anyway).