Custom Form Validation

public static function getSubscribedEvents()
{
    return [
        'onFormProcessed' => ['onFormProcessed', 0]
    ];
}
public function onFormProcessed(Event $event)
{
    $form = $event['form'];
    $action = $event['action'];
    $params = $event['params'];

    switch ($action) {
        case 'uniqueUser':
        .
        . 
        .
}

public static function getSubscribedEvents()

{

return [

‘onFormProcessed’ => ['onFormProcessed', 0]

];

}

public function onFormProcessed(Event $event)

{

$form = $event['form']; 

$action = $event['action'];

$params = $event['params'];

switch ($action) {

case ‘uniqueUser’:

.

.

.

}

process:

– validate: uniqueUser

“Argument 1 passed to Grav\Plugin\FormPlugin::onFormValidationError() must be an instance of Grav\Toolbox\Event\Event, instance of RocketTheme\Toolbox\Event\Event given