help please these is the error
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at MethodInfo-3967()[Source/scripts/Design_25_25_CharactersSwap.hx:103]
at com.stencyl::Engine$/invokeListeners2()[C:\Program Files (x86)\Stencyl\plaf\haxe\lib/stencyl/1,00/com/stencyl/Engine.hx:4020]
at com.stencyl::Engine/update()[C:\Program Files (x86)\Stencyl\plaf\haxe\lib/stencyl/1,00/com/stencyl/Engine.hx:2441]
at com.stencyl::Engine/postUpdate()[C:\Program Files (x86)\Stencyl\plaf\haxe\lib/stencyl/1,00/com/stencyl/Engine.hx:2732]
at com.stencyl::Engine/onUpdate()[C:\Program Files (x86)\Stencyl\plaf\haxe\lib/stencyl/1,00/com/stencyl/Engine.hx:2725]
