( ! ) Fatal error: Class AppKernel contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Serializable::serialize) in C:\wamp64\www\gevapo\app\AppKernel.php on line 6
Call Stack
#	Time	Memory	Function	Location
1	0.0001	359744	{main}( )	...\app.php:0
2	0.0010	368656	spl_autoload_call ( )	...\app.php:10
3	0.0010	368696	Composer\Autoload\ClassLoader->loadClass( )	...\app.php:10
4	0.0010	368696	Composer\Autoload\includeFile( )	...\ClassLoader.php:322
5	0.0011	369248	include( 'C:\wamp64\www\gevapo\app\AppKernel.php' )	...\ClassLoader.php:444