( ! ) Fatal error: Uncaught Error: Call to undefined function wp_is_valid_utf8() in /home/okey/iok/wp-includes/formatting.php on line 1140
( ! ) Error: Call to undefined function wp_is_valid_utf8() in /home/okey/iok/wp-includes/formatting.php on line 1140
Call Stack
#	Time	Memory	Function	Location
1	0.0007	356784	{main}( )	.../index.php:0
2	0.0011	357096	require( '/home/okey/iok/wp-blog-header.php )	.../index.php:17
3	0.0012	357512	require_once( '/home/okey/iok/wp-load.php )	.../wp-blog-header.php:13
4	0.0014	358304	require_once( '/home/okey/iok/wp-config.php )	.../wp-load.php:50
5	0.0017	360088	require_once( '/home/okey/iok/wp-settings.php )	.../wp-config.php:104
6	0.0579	2146464	include_once( '/home/okey/iok/wp-content/plugins/w3-total-cache/w3-total-cache.php )	.../wp-settings.php:476
7	0.0579	2146768	require_once( '/home/okey/iok/wp-content/plugins/w3-total-cache/Root_Loader.php )	.../w3-total-cache.php:73
8	0.0582	2151832	W3TC\Root_Loader->run( )	.../Root_Loader.php:274
9	0.0582	2151832	W3TC\Generic_Plugin->run( )	.../Root_Loader.php:140
10	0.0582	2159136	sanitize_text_field( $str = 'Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)' )	.../Generic_Plugin.php:32
11	0.0582	2159136	_sanitize_text_fields( $str = 'Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)', $keep_newlines = FALSE )	.../formatting.php:5591
12	0.0582	2159136	wp_check_invalid_utf8( $text = 'Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)', $strip = ??? )	.../formatting.php:5649