Avoid static method when throwing exception for better trace log

Signed-off-by: Sam Poyigi <6567634+sampoyigi@users.noreply.github.com>

src/Http/Controllers/Outgoing.php

@@ -62,11 +62,11 @@ public function __construct()
     public function onLoadSetupInstructions()
     {
         throw_unless($eventCode = post('setup_event_code'),
-            FlashException::error('Please choose an event.')
+            new FlashException('Please choose an event.')
         );
 
         throw_unless($eventObj = resolve(WebhookManager::class)->getEventObject($eventCode),
-            FlashException::error('Event not found')
+            new FlashException('Event not found')
         );
 
         return [