Your wordpress is updated to latest version ?
You plugins are updated ?
If you disable plugins the error goes away ?
Anyways go to wp-config.php and look for wp_debug and change from define( ‘WP_DEBUG’, false ); to define( ‘WP_DEBUG’, true ); also add this under the wp_debug true
define( ‘WP_DEBUG_LOG’, true );
https://codex.wordpress.org/Debugging_in_WordPress
Look if any other error appears on screen after you enable the wp_debug, the WP_DEBUG_LOG will store all errors into debug.log in /wp-content/
You can check if some error on your site by checking the /wp-content/debug.log file
Let me know
Cheers
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