[Haskell-cafe] Can't explain this error

[Dinh Tien Tuan Anh]

  could anyone tell me what i did wrong with this please

sumHam :: Integer -> Float
sumHam n = sum [1/x | x<-[1..n]]

Error: type error in explicitly typed binding
**** Term:                 sumHam
**** Type:                  Integer -> Integer
**** Does not match : Integer -> Float




it only works if i remove the first line. Tried changing Float by Double and 
still not working

Pls help
Cheers

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