Patch Available - GMS 1.19

Did you put a space between .exe and Game?

Yep.

Same for me, but what I did was remove the last part of the target and just replaced that with the fix previously mentioned and it seemed to work. It should look like "C:\Nexon\MapleStory\MapleStory.exe GameLaunching" assuming you're Nexon folder is in your C:\ drive.

Yep. It told me that was invalid.