My declaration is as followed:- type Address = Int data Port = C | D deriving(Eq,Show) data Payload = UP[Char] | RTDP(Address,Port) deriving(Eq,Show) data Pkgtype = RTD | U deriving(Eq,Show) type Pkg = (Pkgtype,Address,Payload) type Table = [(Address,Port)] findport::[Pkg]->[Table]->[([Pkg],[Pkg])] findport [(pt,ad,pa)] [(a,p)] | ( p == C) = ([pt,ad,a],[]) | otherwise = ([],[pt,ad,a]) Error received:- Type error in explicitly typed binding *** Term : [(a,p)] *** Type : [(a,b)] *** Does not match : [Table] Can anyone please help? -- View this message in context: http://www.nabble.com/Need-help-from-a-newby-tf4735009.html#a13540531 Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.