lucee.transformer.library.tag.TagLibException coldbox error

Question

I am trying to make a helper for my view. I want to edit the template css.

view filename: index.cfm helper filename: indexHelper.cfm

my helper content:

<cfoutput>
  <style>
    .link-color{
      color:red;
    }
  </style>
</cfoutput>

Before i add the helper there is nothing wrong but after i added the helper i get this error.

Oopsy! Something went wrong!
Type: template
Messages: lucee.transformer.library.tag.TagLibException