( ! ) Notice: Use of undefined constant ABSPATH - assumed 'ABSPATH' in C:\wamp64\website\wp-content\plugins\polylang\include\widget-calendar.php on line 4
Call Stack
#	Time	Memory	Function	Location
1	0.0019	304112	{main}( )	...\widget-calendar.php:0

( ! ) Warning: require_once(ABSPATH/wp-includes/default-widgets.php): failed to open stream: No such file or directory in C:\wamp64\website\wp-content\plugins\polylang\include\widget-calendar.php on line 4
Call Stack
#	Time	Memory	Function	Location
1	0.0019	304112	{main}( )	...\widget-calendar.php:0

( ! ) Fatal error: require_once(): Failed opening required 'ABSPATH/wp-includes/default-widgets.php' (include_path='.;C:\php\pear') in C:\wamp64\website\wp-content\plugins\polylang\include\widget-calendar.php on line 4
Call Stack
#	Time	Memory	Function	Location
1	0.0019	304112	{main}( )	...\widget-calendar.php:0