Cannot build VS 2015 C++ project

[guth]

I load the sln file as Open Other Workspace -> Visual Studio .Net Solution
It loads and I can edit C++ with tagging support, but when trying to build I get the message "This operation should only take place on the UI thread."

[Lee]

I've encountered this error message before, but the only workaround I have been able to find is build the specific project/configuration one time in Visual Studio, then return to SlickEdit for subsequent builds.  That usually works, there is likely some support or configuration file that can only be generated by Visual Studio required that can't be done on the command-line.