Question Essentials Buy/sell/free permission for group manager won't work period

OMG Please help! Ive been trying for about 2 hours now, but it still won't work! Ive tried every permission for player, essentials signs works, but not for non-ops. Ive tried essentials.signs.use.* essentials.signs.use.* everything you can think of! Ive tried essentials.signs.use.free and stuff like that. Ive done /manload and pretty much anything you can think of! i have even tried using this on spigot. Everything won't work and my players can't use the shop! They right click and nothing happens. It works fine for ops tho! Please halp!