'(lang)' is not recognized as an internal or external command

[Wapplee]

every time i run any language, python, lua, etc this happens, error code underneath

[Running] lua "this is a path, ignore/tempCodeRunnerFile.lua" 'lua' is not recognized as an internal or external command, operable program or batch file.

[Done] exited with code=1 in 0.02 seconds

code: function cube(num) return numnumnum end print(cube(3))

please help, i really wanna run code :/