Andy Chase

The Drupal Form API is a wonderful thing… once you’ve been using it long enough, it’s easy to forget all of the laborious validation and post-submit processing you used to do by hand for each and every HTML form in your solution.

The FAPI does things its own way, though, and if you’re building especially complex forms that involve multiple steps or dynamically generated options, you may encounter the following error upon submitting your form:

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