Using Result library

[namngrg]

I am using the results library (<https://github.com/arnetheduck/nim-results>)

This is the function
    
    
    proc getValue(node: ValuesNode, key: Bytes32) : Result[Bytes32, string] =
      ## Returns the value stored at the given `key`
      if node.values[key[^1]] == nil:
        return err("Value not found")
      else:
        return cast[Bytes32](node.values[key[^1]])
    
    
    Run

I simply want to return the Bytes32 type if everything is correct else return 
an error but I am not able to return the Bytes32 value