Please update to latest minifier api `path('minifier', { 'f' : 'include/jslibs/jquery-ui-1.8.17/css/ui-lightness/jquery-ui-1.8.17.custom.css,include/jslibs/jquery-treeview/jquery.treeview.css,include/jslibs/jquery.contextmenu.css,skins/account/geonames.css,skins/common/main.css,skins/admin/css/Main.css,skins/admin/css/Bases.css,skins/admin/css/Tables.css,skins/admin/css/fields.css' })`