.swf Problem..

Hi guys maybe you can help me whit my problem. When i open the .swf clien this is what appears
and i can't play:
[HTML]TypeError: Error #1009: Cannot access a property or method of a null object reference.
at _-1Xf::_-17S$/_-w5()
at _-1Xf::_-17S/_-fz()
at _-1Xf::_-17S/apply()
at com.company.assembleegameclient.appengine::SavedCh aracter()
at com.company.assembleegameclient.appengine::_-dV/_-1Bo()
at com.company.assembleegameclient.appengine::_-dV()
at _-0EK::_-13q/execute()
at _-0JY::_-1bI/_-0Zg()
at MethodInfo-11()
at _-Ct::Slot/execute()
at _-Ct::_-1Wm/dispatch()
at _-1E7::_-14J/_-14B()
at _-1E7::_-14J/onComplete()
at _-Ct::Slot/execute()
at _-Ct::_-1Wm/dispatch()
at _-58::_-Ks/_-1Jz()
at _-58::_-Ks/_-EE()
at _-58::_-Ks/onComplete()
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at flash.net::URLLoader/onComplete()
[/HTML]

If you can help me i will be pretty much grateful..

Cya!