“Missing compiler required member” error being thrown multiple times with almost no changes to code

Question

Today after deploying some changes to a C# MVC site that I run, I went back to make some more modifications and came across this error:

Missing compil

Answer 1

I don't have a correct solution, but I'll add my data point:

In my case the error is caused by referencing GoogleSearchAPINet20

Here is what happens:

• I close the solution that builds
• I open the solution again. It still builds
• As soon as I make any change and try to build, I get 19 "Missing compiler required member ..." errors
• I remove the reference to GoogleSearchAPINet20
• I add back the reference to GoogleSearchAPINet20
• I build the solution. It builds without errors
• I can now make code changes, build or perform any other actions with solution correctly as long as my Visual Studio is open
• I close Visual Studio
• Repeat from step one

I'm not referencing System.Core.dll in my solution at all and my target framework is .NET 4.

I'm a bit annoyed at this point ...