Version 4.6.0

system/Theme/Dev/Theme.php

@@ -645,7 +645,7 @@ class _Theme extends \IPS\Theme
 	 * @param	int	   			$id	Theme Set Id (0 if IN_DEV and not in advanced theming mode)
 	 * @return	void
 	 */
-	public static function importDevResources( $app=NULL, $id )
+	public static function importDevResources( $app, $id )
 	{
 		foreach( new \DirectoryIterator( \IPS\ROOT_PATH . '/applications/' ) as $dir )
 		{