Dynamics 365, CRM 2016 - Method not found: '!!0[] System.Array.Empty() error solution

If you are developing a plugin or a custom workflow, and you are sure that there is nothing wrong with your code, but it gives a weird error "Method not found: '!!0[] System.Array.Empty()"  !!.

So what is the problem then?!

Check your Visual studio solution properties, if your solution's framework is above 4.5.2, return it back to .net 4.5.2 framework, build your solution and update your assembly and hopefully this will work.

Happy CRMing :)