package01e.hs:2:1: Failed to load interface for ‘Data.Map’ It is a member of the hidden package ‘containers-0.5.5.1’. Use -v to see a list of the files searched for. package01e.hs:3:1: Failed to load interface for ‘Data.IntMap’ It is a member of the hidden package ‘containers-0.5.5.1’. Use -v to see a list of the files searched for.