@wfpeter after doing bit of play around, I figured out that change wp admin login plugin is causing the error. After disabling the plugin it worked. But I need that plugin to be there in the website. Can you please recommend any solution?
Can someone help with this? I tried clearing cache, reinstalling license etc, but nothing seems to work.
Thank you for the reply @wfpeter I tried reinstalling with a new license key but it dint work, Later on I restored to an old copy of the website to resolve the issue. I am using wp total cache plugin, would that cause any issue like this?