Display custom error message in proper format

Questions & Help Questions
,
1

I have a list of values like this

  result = [:id, :title, :id]

I am using comprehensions to iterate over them and display the error message which looks like this:

    for n <- result, do: {n, "field doesn't exist"}
       [
          id: "field doesn't exist",
          title: "field doesn't exist",
          id: "field doesn't exist"
       ]

what I want the output is like this:

     errors:{
        id : "field doesn't exist"
      }

How can I format it like this?

Thanks