my system check told me latexmk is available, but every time I press "Ctrl+B" it told me :
error: The command line tool "latexmk" is not available on your path. Please check your settings.
Please help me with it!
Oh I found it's a stupid mistake that I also installed Latexing and it was the default one. So although my Latextools set correct, it didn't work... uninstall Latexing will fix this.