Commented Unassigned: A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll [108]

I'm not able to get over @Styles.Render("~/Content/style-bundle") (VisualStudio hangs there...)

Only way how to continue in debugging is stop and then attach to w3wp process.

Here's debug output:

A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in IronRuby.Libraries.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll

BundleTransformer.Core: 1.9.52
BundleTransformer.SassAndScss: 1.9.64
Comments: Hello! This error is not relevant, because in [Bundle Transformer 1.9.81](http://bundletransformer.codeplex.com/releases/view/618390) the [Ruby Sass](https://github.com/sass/sass) was replaced by [libSass](https://github.com/sass/libsass).