[Murder]

I have downloaded buffbars and have done the step by step tutorial on this plugin is there idea why when i type /plugin load buffbars or pengorasplugins since that is what the file is named i get a responce unable too load buffbars or unknown command. I have installed the beta version of ui given in this post the 7z file and extracted it into the plugin file alonf with the file given by pengoras. Any help qould be appreciated ty