Error deploying app with reference to WPF toolkit

Hi,

I have a wpf application that contains elements from the wpf toolkit. I can run the project fine in visual studio but when i try to publish it and run the generated .exe i get the following error:

the application requires that assembly wpftoolkit 3.5.40128.1 be installed in the global assembly cache

Select allOpen in new window

I have these dlls added as a reference, when i remove any reference to these the project deploys and runs fine.

I get this error on my development machine and any other machine, i've tried setting all prerequisites to 'include' but this made no difference