@ BabyBottle
Well now I see in your image that the Ahn-Lab hackshield is essentially a part of the MapleStory, and that was mentioned in your behavior shield log. Even though it was allowed it is possible that for a short period of time the Ahn-Lab hackshield element would have been unable to start resulting in the error.
So you could try adding the full path to the MapleStory executable (in the behavior shield log) into the trusted processes and see if that works.
I'm unsure how the autosandbox would be 90% of the problem as the autosandbox is set to ask, so if you aren't being asked about Ahn-Lab hackshield or MapleStory files then it shouldn't be involved. But there is nothing to stop you adding that path to the Files that will be excluded from automatic sandboxing.