Microsoft (R) Program Maintenance Utility Version 7.00.8882 Copyright (C) Microsoft Corp 1988-2000. All rights reserved. C:\cpanrun-5.8\build\5-8-0\bin\perl.exe "-Iblib\lib" "-Iblib\arch" test.pl 1..6 ok 1 ok 2 ok 3 Can't locate object method "differentiate" via package "Math::Calculus::Expression" at blib\lib/Math/Calculus/TaylorSeries.pm line 149. NMAKE : fatal error U1077: 'C:\cpanrun-5.8\build\5-8-0\bin\perl.exe' : return code '0xff' Stop.