Beginner Haskell problems (No instance for … arising from)?

You have to replace and by &&. The first one is a function (prefix) that receives a list of boolean values and calculates an and of them all. The second one is a true logical and.

The error message is a little bit confusing though. Whenever I get such a strange error message, I usually start to annotate my code with type signatures. Then the compiler is able to give you a more detailed description of what went wrong.

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