Internal error when using page templates

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Problem statement

We’re running into this generic “internal error” on login for users on our app when using page templates.

Symptoms

  • Internal error returned by universal login pages
  • Page template in use

Steps to reproduce

Apply the page template:

<!DOCTYPE html><html>
  <head>
    {%- auth0:head -%}
  </head>
  <body>
    {%- application.id -%}
    {%- auth0:widget -%}
  </body></html>

Attempt to login to tenant using custom domain so page templates are used.

Cause

Liquid syntax differentiates tags and variables with :

{% abc %}

and

{{ abc }}

respectively. This can cause errors at render time if these are used incorrectly.

Solution

A potential cause of this error is incorrect liquid syntax being used within the New Universal Login page’s template. For example liquid syntax differentiates tags and variables as below respectively:

{% abc %}  // This is a tag
And
{{ abc }} // This is a variable

Please see the below links for what variables are available within a page template, and more information on the liquid syntax: