Site stops working on adding any plugin

Hello @prateek21289,

If the problem remains the same if you try to use a theme like TwentyTwenty then it’s most likely the PHP Memory Limit: https://www.wpbeginner.com/wp-tutorials/fix-wordpress-memory-exhausted-error-increase-php-memory/

But you can check for sure the cause behind the problem if you enable WP Debug, and then continue based on the report: https://www.wpbeginner.com/wp-tutorials/how-to-set-up-wordpress-error-logs-in-wp-config/

When you enable WP Debug, you need to take the same steps to replicate the issue which will generate the error log.

You will find the error log in your local installation WP folder/wp-content

Best of luck

Thanks Marko.
The article on WP Debug says “Open the wp-config file in any text editor and look for the line that says ‘That’s all, stop editing! Happy blogging.'”
But I could not find that text in my wp-config file.
What should be my next step?

Ok, I found it, the line has changed slightly to ‘That’s all, stop editing! Happy publishing.’
thanks!

Hey Marko, increasing the memory limit requires us to login to the C Panel of the hosting provider. But here since I am using localhost, how can I log in to the C Panel?
Is there a way to setup debugging or to increase the php memory within WP Admin Panel?
I tried editing the wp config file in WP FIle Manager and saved it, but that did not work.