An error message appears from the litespeed cache plugin. It disappears when you disable the plugin, and comes back when you enable it.
Even after deleting the plugin and reinstalling it, the same thing happens.
The error message is as below.
Attempt to read property "public" on null in /home/u561951422/domains/neture.co.kr/public_html/wp-content/plugins/litespeed-cache/src/metabox.cls.php on line 55
Hello. Thank you for contacting the Toolset support.
As you shared the error:
Attempt to read property "public" on null in /home/u561951422/domains/neture.co.kr/public_html/wp-content/plugins/litespeed-cache/src/metabox.cls.php on line 55
The error/notice belongs to the "litespeed-cache" plugin so you should report this to the "litespeed-cache" plugin support and check with them how you can fix this.
