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The new helicopter script gives me an error
[00:56:05] [INFO] Paused script NewsHelicopter.Renderer.
[00:56:05] [ERROR] Caught unhandled exception:
System.MissingMethodException: Method not found: 'Boolean ExtraExtensions.DoesExist(GTA.PoolObject)'.
at NewsHelicopter.Main.UpdateAI()
at NewsHelicopter.Main.OnTick(Object sender, EventArgs e)
at SHVDN.Script.DoTick()
[00:56:05] [ERROR] The exception was thrown while executing the script NewsHelicopter.Main from "C:\Program Files (x86)\Steam\steamapps\common\Grand Theft Auto V\scripts\NewsHelicopter.dll".
[00:56:05] [ERROR] Caught unhandled exception:
System.MissingMethodException: Method not found: 'Boolean ExtraExtensions.DoesExist(GTA.PoolObject)'.
at NewsHelicopter.Main.OnAbort(Object sender, EventArgs e)
at SHVDN.Script.Abort()
[00:56:05] [ERROR] The exception was thrown while executing the script NewsHelicopter.Main from "C:\Program Files (x86)\Steam\steamapps\common\Grand Theft Auto V\scripts\NewsHelicopter.dll".
[00:56:05] [WARNING] Aborted script NewsHelicopter.Main.
at System.Threading.Thread.AbortInternal()
at System.Threading.Thread.Abort()
at SHVDN.Script.Abort()
at SHVDN.Script.DoTick()
at SHVDN.Script.MainLoop()

How do i get the simple trainer working? it stopped working after i installed 4.1.1