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I get an error when running the game.

```

Creating OpenGL window...

debugger invoked on a TYPE-ERROR in thread
#<THREAD "main thread" RUNNING {10027FE5C3}>:
The value
NIL
is not of type
SB-SYS:SYSTEM-AREA-POINTER



Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.



restarts (invokable by number or by possibly-abbreviated name):
0: [ABORT] Exit debugger, returning to top level.



(LISPBUILDER-SDL-BASE:SURF-W NIL)

```