clear error ProcessWire

clear_errors.php

<?php
wire()->addHookAfter('InputfieldForm::processInput', function($event) {

  $form = $event->object;
  if($form->name != 'your-form-name') return;
  $email = $form->getChildByName('email'); 

  if($email) foreach($f->getErrors(true) as $error) { // true clears existing errors
    if($error == 'Missing required value') {
      $f->error('Please enter a valid email address'); // replace error message 
    } else {
      $f->error($error); // other error, stuff it back in there
    }
  }

});