Did this happen before too, were you able to start the game, or is now the first time it crashes?
Did you made some edits to the maps script recently? Does the map crash if the script file is empty (test it, but make a backup first)? If so, try loading the map with an empty script (or a working version of the script), then bring up the
debug menu (F1); in Notepad++ (or whatever you're using to edit code) paste in the current version of the script, and click "Recompile script & lang" or "Quick Reload" in Amnesia. Does it show any errors?
P.S. I bet it's related to a string parameter in a method. IMO, AngelScript string type implementation in HPL2 is a little buggy.