I had the same issue. I was working on Save-Load system for my game by Playmaker only and after clicking to Load button second time, it was giving me Stack Error:1 error. (It is similar to Kevron's issue that he mentioned in his second message, after clicking a second time, that happens. Actions work first time, but don't work second time)
In my case, the error was pointing the Load button as the source of the problem, however the error was due to wrong order of Playmaker actions in a different FSM State, which Loading supposed to produce those actions with an event.
After fixing that wrong order, Stack Error:1 disappeared instantly. Therefore, I suggest to people to check their other FSMs in other related objects as well, fix the wrong Playmaker action order, I hope this can be remedy to fix errors for somebody.