... 
Function:ScenEdit_AddMission (0)  Error:Existing mission Murtala Mohammed International Airport
Exception: [string "ScenStart"]:162: attempt to index a nil value (local 'mission')
Stack Trace:    at NLua.Lua.ThrowExceptionFromError(Int32 oldTop)
   at NLua.Lua.DoString(String chunk, String chunkName)
   at Yk6JGVsqnXSlgleMG4Rc.tLw78OyeDlS(Object , String , String , Yk6JGVsqnXSlgleMG4Rc )
   at Command_Core.Lua.LuaSandBox.RunScript(String str, Boolean RunInteractively, String script, String fullPath)

