On Wed, May 27, 2015 at 4:15 AM, Dananji Liyanage <dan9131@gmail.com> wrote:
<interactive>:41:18:
    Couldn't match expected type ‘Data.Vector.Vector a’
                with actual type ‘vector-0.10.9.1:Data.Vector.Vector Int’
    NB: ‘Data.Vector.Vector’
          is defined in ‘Data.Vector’ in package ‘vector-0.10.12.3’
        ‘vector-0.10.9.1:Data.Vector.Vector’
          is defined in ‘Data.Vector’ in package ‘vector-0.10.9.1’

Did you read the message? It is telling you that you have two versions of the vector package installed, and it is unable to reconcile them.

You should likely remove one of them --- and in the future use sandboxes so that you can avoid this kind of conflict.

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