Compiling Mission Planner - Visual Studio Error Code CS1061

Thank you so much CielRov that fixed it. It built to completion. I’m running the debug Mission Planner.
Thanks again.

Unfortunately, this did not help me. I have everything installed in my VS 2017 community, but still doesnt work.
The refference to System.Speech dll still doesnt not exist

But i fixxed it with hardcoded path like
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.6.1
Only it that case it worked for me