Upgrading WebGrease to version 1.3.0 gets me error

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Here is the answer that has worked for me, and it is a combination of some of the above answers.
First install / uninstall / reinstall the following packages:

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

Then make a copy of the contents of ~/Views/Shared/_Layout.cshtml
delete the _Layout.cshtml file, recreate it and paste the contents back in.

this is the final fix that has worked for me.

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