Error #1067: Implicit coercion of a value...

I've been working on this game for class (I'm pretty novice, FYI) and I'm having trouble with this one error... mentioned in the title. I've had this error for a couple of weeks and I don't know what to do to fix it. I've uploaded my zip file for anyone who can PLEASE PLEASE PLEASE help me figure this out... or at least point me in the right direction of how to fix it. Thanks everyone... seriously. I just wanna finish my first game and you all can help me do that.

Zip File Link- http://hotfile.com/dl/126923897/44a8...vival.zip.html

you probably need to cast a variable to the correct data type like number to string

String(23);