Just trying out the tutorial: there may be an error on step 11. followed the instruction to type out 'a' : [] and got: λ 'a' : [] can't find file: Imports.hs

Just trying out the tutorial: there may be an error on step 11. followed the instruction to type out 'a' : [] and got: λ 'a' : [] can't find file: Imports.hs It worked when I clicked on the command, but that may not be obvious to a new user. λ 'a' : [] "a":: [Char]