Trying to compile Aseprite

I’ve tried to compile Aseprite following this tutorial: - YouTube

When I run ninja aseprite it says the following error:

CreateProcess failed. Command attempted:
“cmd.exe /C “cd /D C:\aseprite\build\src && “C:\Program Files\CMake\bin\cmake.exe” -E copy C:/aseprite/src/…/README.md C:/aseprite/build/bin/data/README.md””
ninja: fatal: CreateProcess: Acesso negado.