( ! ) Notice: Use of undefined constant ABSPATH - assumed 'ABSPATH' in C:\wamp64\www\site\wordpress\wp-admin\includes\class-wp-upgrader.php on line 13
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#	Time	Memory	Function	Location
1	0.0002	239776	{main}( )	...\class-wp-upgrader.php:0

( ! ) Warning: require_once(ABSPATHwp-admin/includes/class-wp-upgrader-skin.php): failed to open stream: No such file or directory in C:\wamp64\www\site\wordpress\wp-admin\includes\class-wp-upgrader.php on line 13
Call Stack
#	Time	Memory	Function	Location
1	0.0002	239776	{main}( )	...\class-wp-upgrader.php:0

( ! ) Fatal error: require_once(): Failed opening required 'ABSPATHwp-admin/includes/class-wp-upgrader-skin.php' (include_path='.;C:\php\pear') in C:\wamp64\www\site\wordpress\wp-admin\includes\class-wp-upgrader.php on line 13
Call Stack
#	Time	Memory	Function	Location
1	0.0002	239776	{main}( )	...\class-wp-upgrader.php:0