ajaysaini

Hello,
This can be caused by these
This WP error is common and you see it when your browser gathers cache
If there is any installation issue
This issue may be due to use of many plugins (conflicting plugin) as these Plugins starts interfering JS files.
This may be due to lack of TinyMCE plugin in your theme
I give a good solution for this problem please check this articleWhite text or missing buttons in the visual editor

This is very useful for this problem
Thank you

Hi,

Okay for your problem.
I give a good solution for your problem you check this article.
this is very good useful
Woo-commerce Template overriding Problem

Thank you

Hi,
This can be caused by these
WordPress permit plugins and users to supersede some convinced core functions. All these functions are normally located in the pluggable.php file.

If in any case due to any certain reason if custom code snippet or wordpress plugin fail properly handle any one of these functions, then you will see the error like this

I give good solution for your problem Please check this article
WordPress pluggable.php File Error

Thank you

Hello,
This can be caused by these
This issue is not specific to WP site, it can occur with any website. This can arise due to theme or plugin functions, PHP memory limit and corrupted .htaccess file.
Corrupted WP core files
Corrupted .htaccess files
Problematic plugins
PHP memory limit issues
Problematic theme
I solve your problem. you check this article
http error 500 WordPress