[eluser]Armchair Samurai[/eluser]
Just as a quick note, the Form Validation library automatically loads the Form helper, so there's no need to load it individually. The validation_errors() function is in the form_helper.php file.
In regards to your specific problem, CINoob, in your example, you haven't added any validation rules. There have been some reports in the forum that not setting rules for fields caused the Form Validation library to throw errors - try adding rules for all your fields and see if that helps.