[SOLVED][Drupal Errors] Warning: Cannot modify header information

By | 19th Dec 2012 | 1 min read

Many Drupal programmers, Drupal site admins and Drupal site users have encountered errors similar to "Warning: Cannot modify header information" in their Drupal site. If you are facing the same situation in your Drupal site then read on to find out the solution.

  • If you are getting a Cannot modify header information error then it means that somewhere in the codebase something was passed to the browser before Drupal supplied the page.
  • This is most likely caused by unwanted characters in contributed modules or in custom modules and themes
  • Check and inspect all custom and contributed modules and themes to solve the error message

Hope that helps.

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