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Visual Studio encounters an exception when loading a project


I've installed the extension successfully but when I load a project, either with or without .boo files, Visual Studio shows a message that it has encountered an exception. The exception message is:
System.IO.FileNotFoundException: Could not load file or assembly 'Boo.Lang, Version=, Culture=neutral, PublicKeyToken=32c39770e9a21a67' or one of its dependencies. The system cannot find the file specified. File name: 'Boo.Lang, Version=, Culture=neutral, PublicKeyToken=32c39770e9a21a67&' at BooPegLexer.PegLexer.$initializer$()...
I was able to work around this by manually copying the missing Boo.* dlls to the "C:\Users\USERNAME\AppData\Local\Microsoft\VisualStudio\10.0\Extensions\Tomáš Pastorek\BooSyntax\1.0" directory.