buy signs not linking

[timtornado]

so im using sign shops gunpowder and gunpowder currency. currently, i am able to get the admin shops to work properly but when players try to use the normal [gp:buy] sign it tells them its not linked to storage and makes the sign go poof. i placed a chest then put the item in the first slot then right-click the chest with the gold nugget and get the message marked container @ xyz then place a sign with [bgp:buy] $(cost) on next line then item type on next line of the sign... the sign turns blue and states im selling x of y but then when people try to use it they are told its not linked to storage of any kind

is there a permissions node for the standard use of buy sell signs? even as Op the sign doesnt seem to function unless its an [gp:adminbuy] sign