What mistake is that?

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I am trying to change the css of my application in Asp.net mvc 5, but when trying to do this returned me this error ai. Does anyone know why?

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Possibly your Webgrease and your Microsoft.AspNet.Web.Optimization are out of date. You can update from the Visual Studio panel:

Extensions and Updates

Or via command, via Package Manager Console:

Update-Package Microsoft.AspNet.Web.Optimization
Update-Package WebGrease

Also check if there are no files .js in the Bundle styles. Can’t mix types.

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