yay -R compton                              
error: target not found: compton

picom --vsync -r 12 --no-fading-openclose -b
[ 10/12/2020 15:31:05.725 open_config_file_at WARN ] This compositor has been renamed to "picom", the old config file paths is deprecated. Please replace the "compton"s in the path with "picom"
[ 10/12/2020 15:31:05.725 parse_config_libconfig WARN ] Option `no-dock-shadow` is deprecated, and will be removed. Please use the wintype option `shadow` of `dock` instead.
[ 10/12/2020 15:31:05.725 parse_config_libconfig WARN ] Option `no-dnd-shadow` is deprecated, and will be removed. Please use the wintype option `shadow` of `dnd` instead.
[ 10/12/2020 15:31:05.725 parse_config_libconfig WARN ] Option `menu-opacity` is deprecated, and will be removed.Please use the wintype option `opacity` of `popup_menu` and `dropdown_menu` instead.
[ 10/12/2020 15:31:05.725 parse_config_libconfig WARN ] vsync option will take a boolean from now on. "opengl-swc" is interpreted as "true" for compatibility, but this will stop working soon
[ 10/12/2020 15:31:05.725 parse_config_libconfig WARN ] glx-swap-method has been deprecated since v6, your setting "undefined" should be replaced by `use-damage = true`.
[ 10/12/2020 15:31:05.725 parse_config_libconfig WARN ] "clear-shadow" is removed as an option, and is always enabled now. Consider removing it from your config file
[ 10/12/2020 15:31:05.725 parse_config_libconfig ERROR ] "paint-on-overlay" has been removed as an option, and the feature is enabled whenever possible
[ 10/12/2020 15:31:05.725 main FATAL ERROR ] Failed to create new session.