Hello,
It seems there can be some theme or plugin conflict which might have caused this.
I would suggested activating the default theme and deactivating the plugin via the FTP or cPanel access.
if you have the hosting details try to access the files and try this.
Errors like this are logged. Check the error log on your server. If you can’t find the log, please contact your host.
Meantime, enable wp_debug and wp_debug_log and after an error, look at wp-content/debug.log to see if anything gets logged there. https://wordpress.org/support/article/debugging-in-wordpress/
You can also try this: Please attempt to disable all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.
If you cannot access wp-admin, there are other ways to deactivate plugins.
Hope this information helps.
thank you so much for your helped. It solved. 🙂
Happy to help!
Feel free to ask if you need any other assistance or else you can mark this topic as resolved.
Thanks.
