Hello everybody, when I compile the file https://github.com/sunilnandihalli/is2/blob/master/main.hs I get main.hs:28:64: Could not deduce (Enum (a, t0)) arising from the arithmetic sequence `0 .. ' from the context (Integral a) bound by the type signature for plotAsString :: Integral a => [(a, a)] -> (a, a) -> String at main.hs:(26,1)-(38,41) Possible fix: add (Enum (a, t0)) to the context of the type signature for plotAsString :: Integral a => [(a, a)] -> (a, a) -> String or add an instance declaration for (Enum (a, t0)) In the second argument of `zip', namely `[0 .. ]' In the first argument of `M.fromList', namely `(zip locs [0 .. ])' In the expression: M.fromList (zip locs [0 .. ]) main.hs:28:65: Could not deduce (Num (a, t0)) arising from the literal `0' from the context (Integral a) bound by the type signature for plotAsString :: Integral a => [(a, a)] -> (a, a) -> String at main.hs:(26,1)-(38,41) Possible fix: add (Num (a, t0)) to the context of the type signature for plotAsString :: Integral a => [(a, a)] -> (a, a) -> String or add an instance declaration for (Num (a, t0)) In the expression: 0 In the second argument of `zip', namely `[0 .. ]' In the first argument of `M.fromList', namely `(zip locs [0 .. ])' can somebody help? Thanks, Sunil.