You have invalid or expired Ajax Load More license keys

@nitinlondey Sounds like you haven’t input your license (or it’s expired) to one of the ALM addons.

Where can I find those license keys though?

Did you buy the add-on? Go to the Ajax Load More > Licenses screen and you can see which one requires a license.

I haven’t purchased any add ons.
The license screen show you don’t have a license for Custom Repeaters v2 add on

Ok. ALM add-ons require a license.
https://connekthq.com/plugins/ajax-load-more/add-ons/custom-repeaters/

And one more thing we have a template inside the Custom Repeaters v2 plugin.
where can I find the CSS for the code which is inside the template?

Im not sure. Likely in your theme somewhere.