System.Core not added to reference to assembly

Question

I am currently developing a Aspnet MVC Web application. I am using .NET Framework 4.6.1 and Microsoft.AspNet.Mvc v5.2.6.

I added Kendo.Mvc v2018.3.911.545 to my project and started using Grid Kendo. At first there was no problem at all. After some point, I got following error all of a sudden:

The type 'Expression<>' is defined in an assembly that is not referenced.You must add a reference to assembly 'System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

I tried these links and none of them worked for me:

The type 'Expression<>' is defined in an assembly that is not referenced

VS2017 The type 'Expression<>' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

Compilation error in .NET 4.0 web.config - Linq not found

bogus intellisense error putting red squiggles all over razor views!!

VS 2015 IntelliSense: Assembly Not Referenced Error

Also, I don't want to downgrade Microsoft.Aspnet.Mvc to v.5.2.0 because this action generates new issues at Kendo UI and razor pages.

Also, I tried upgrading .NET Framework to 4.7.1 and downgrading to 4.5 and still no use. I also don't really want to downgrade .NET Framework because while it does not solve my issue, it also generates new ones.

If you have a reference to System.Core in your references, you could use a Binding Redirect to redirect the dependency of the other assembly to your current System.Core version. — Manuel Fuchs, Oct 01 '18 at 08:24
Then it could be, that your assemblies have different public keys. Find out the public key of the used System.Core assembly. (https://stackoverflow.com/questions/3045033/getting-the-publickeytoken-of-net-assemblies) — Manuel Fuchs, Oct 02 '18 at 13:45

System.Core not added to reference to assembly

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