[Alpha Plug-in error]

File: C:\Program Files\Paint.NET\Effects\AlphaBlur.dll

      Effect Name: AlphaBlur.AlphaBlur

      Full error message: PaintDotNet.WorkerThreadException: Worker thread threw an exception ---> System.NullReferenceException: Object reference not set to an instance of an object.

   at AlphaBlur.AlphaBlur.OnSetRenderInfo(PropertyBasedEffectConfigToken newToken, RenderArgs dstArgs, RenderArgs srcArgs)

   at PaintDotNet.Effects.Effect`1.OnSetRenderInfo(EffectConfigToken parameters, RenderArgs dstArgs, RenderArgs srcArgs) in D:\src\pdn\src\Effects\Effect`1.cs:line 67

   at PaintDotNet.Effects.BackgroundEffectRenderer.ThreadFunction() in D:\src\pdn\src\PaintDotNet\Effects\BackgroundEffectRenderer.cs:line 218

   --- End of inner exception stack trace ---

   at PaintDotNet.Effects.BackgroundEffectRenderer.DrainExceptions() in D:\src\pdn\src\PaintDotNet\Effects\BackgroundEffectRenderer.cs:line 431

   at PaintDotNet.Menus.EffectMenuBase.DoEffect(Effect effect, EffectConfigToken token, PdnRegion selectedRegion, PdnRegion regionToRender, IRenderer`1 clipMaskRenderer, Surface originalSurface, Exception& exception) in D:\src\pdn\src\PaintDotNet\Menus\EffectMenuBase.cs:line 1527

[Alpha Plug-in error]

I am getting this message when I try to use the alpha blur effect. I have installed the latest version of paint.net as per January 2016 4.0.9. What do I need to do to fix the problem?