Could not load file or assembly 'WebGrease' one of its dependencies. The located assembly's manifest definition does not match the assembly reference

Question

This issue has many solutions, please read all answers below, they might help you solve your problem too. If you find a new way to solve this, please document in you

Answer 1

I ended up with 2 runtime assemblyBinding entries for WebGrease. Deleting the older one (version 1.5.2) solved my issue.

<dependentAssembly>
    <assemblyIdentity name="WebGrease" publicKeyToken="31BF3856AD364E35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
</dependentAssembly>

<dependentAssembly>
    <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-1.6.5135.21930" newVersion="1.6.5135.21930" />
</dependentAssembly>

Answer 2

Just in case it helps anybody, I had the same issue, but found it was caused by a dependent assembly of WebGrease, namely Antlr3. It had added the following to runtime element in web.config when installing via NuGet:

  <dependentAssembly>
    <assemblyIdentity name="Antlr3.Runtime" publicKeyToken="eb42632606e9261f" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-3.5.0.2" newVersion="3.5.0.2" />
  </dependentAssembly>

Simply removing this fixed my issue.