Hello List, after splitting my module futher i got the following error (see below.) (Btw. I only used very basic haskell functions and no haskell extentions Base.hs:import List Helper.hs:import List Main.hs:import Debug.Trace (trace) Main.hs:import Helper Main.hs:import List Main.hs:import Maybe Main.hs:import System.Random Main.hs:import System.Time RandomHelper.hs:import System.Random ) $ jhc Main.hs jhc Main.hs jhc 0.7.6 (0.7.6-3) Finding Dependencies... Using Ho Cache: '/Users/klausmeier/.jhc/cache' Main [Main.hs] Base [./Base.hs] Helper [./Helper.hs] RandomHelper [./RandomHelper.hs] Typechecking... [1 of 4] RandomHelper (.............................................) [2 of 4] Helper (.............................................) [3 of 4] Base (.............................................) [4 of 4] Main (.............................................) Main.hs:402 - Warning: defaulting: t688 => Jhc.Basics.Integer Main.hs:451 - Warning: defaulting: t333 => Jhc.Basics.Integer Main.hs:451 - Warning: defaulting: t372 => Jhc.Basics.Integer Main.hs:470 - Warning: defaulting: t233 => Jhc.Basics.Integer Compiling... [1 of 4] Helper <..............................www.....ww..........> [2 of 4] Base <.............*............www.w....wwww.wwww.wwwww> [3 of 4] RandomHelper <..........................................wwwwwwww> [4 of 4] Main <..........................w.ww.www.wwww.ww.wwww .w.> Collected Compilation... -- typeAnalyzeMethods jhc: src/E/TypeAnalysis.hs:415:12-31: Irrefutable pattern failed for pattern Data.Maybe.Just vp Greeting, Alf