Why isn't the shortcut for opening coc-settings.json working ?

According to the following link , https://github.com/neoclide/coc.nvim/wiki/Using-the-configuration-file#opening-the-configuration-file in the opening configuration file section , i added the code from there to my .vimrc file but it gives me error saying unknown function SetupCommandAbbrs and few other errors . Where did i went wrong ? Any help is much appreciated.