Just an update, I tried to /w [name] item again, this time I disabled all add-ons except GetDKP and MRT this time it gave me a more clear view of the error.
Code:
Message: Interface\AddOns\GetDKP\GetDKPCore\GetDKP.lua:2011: attempt to index global 'gdkp_sets' (a nil value)
Time: 06/19/11 14:41:43
Count: 1
Stack: Interface\AddOns\GetDKP\GetDKPCore\GetDKP.lua:2011: in function `get_Informations_of_Item'
Interface\AddOns\GetDKP\GetDKPCore\GetDKP.lua:256: in function `GDKP_item_lookup'
Interface\AddOns\GetDKP\GetDKPCore\GetDKP.lua:1544: in function `GDKP_Event'
[string "*:OnEvent"]:1: in function <[string "*:OnEvent"]:1>
Locals: msg = ""
color = nil
item = nil
name = nil
itemlink = ""
aclassde = ""
aclasseng = ""
anamede = ""
anameeng = ""
atier = ""
adrop = ""
LLItemlinkText = ""
ItemName = nil
ItemValues = nil
flag = nil
itemtable = <table> {
}
i = nil
(*temporary) = nil
(*temporary) = ""
(*temporary) = ""
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index global 'gdkp_sets' (a nil value)"
Not sure if this helps. In case you need to take a closer look at my GetDKP.lua it is posted.