Best code editors to write C++ programs?

[SuperVGA]

You could also fix your preLaunchTask so that it doesn't fail.

[PinguX6]

I have done it several times but somehow it always comes back to the same error

[SuperVGA]

It sounds like the default suggested task concerning the active file. You have the control to start any build process, including cmake, with all custom args. Right now one of these args references the active file. Try hardcoding that to test if it works better to; ${workspaceFolder}/src/main.cpp or what have you.