To fix this make sure your Brushify folder is in the following directory:
Content/Brushify/…
Content/Brushify/Maps*(brushify contents etc)/
For example if your pack has is like: BrushifyPack->maps,materials Then make sure “BrushifyPack” is in the content folder of your project and also the name of “BrushifyPack” should be “Brushify”.
It should solve your problem.