I am having trouble with cMake construction with Ninja

I am using the command from https://gitlab.kitware.com/async/async-paraview/-/blob/master/Documentation/dev/build.md:

cmake -G Ninja -S ./async-paraview -B ./build -DAPV_USE_PYTHON=ON -DAPV_USE_VTKM=OFF

I’ve downloaded and have Ninja in the PATH. If there is any more information necessary or a better place to post this question please let me know.

It looks like you have not loaded the MSVC toolchain environment. You’ll need to run vcvarsall.bat to load it. Or use a developer prompt. I see you’re using PowerShell; we use this script to load the batch file as intended. See .gitlab/os-windows.yml for how it gets used.