“Are you missing an assembly reference?” compile error - Visual Studio

Question

I am currently working on a server control for other applications in our company to interface with a WCF service. Every time I make a change code change and recompile the c

Answer 1

If none of the solutions above worked, try this 10-second fix.

Navigate to the startup project in solution explorer. Right click, properties > Application > Target framework. Change the target framework to anything else. Press Yes for the confirmation dialog. Give the changes a few seconds to take effect, then switch the framework back to what it was before.

The error will hopefully go away for you like it did for me!