After upgrading to webgrease 1.5.1.25624 from nuget, System.IO.FileLoadException is coming
Force uninstall the package using Package Manager Console uninstall-package -f WebGrease then install the previous version 1.3.0 using the following command install-package WebGrease -Version 1.3.0 Open your Web.config file and replace below dependency under runtime tag <dependentAssembly> <assemblyIdentity name=”WebGrease” publicKeyToken=”31bf3856ad364e35″ culture=”neutral” /> <bindingRedirect oldVersion=”0.0.0.0-1.3.0.0″ newVersion=”1.3.0.0″ />