@Rishabh-Webkul how to resolve this error sir. I was installing WhatsApp contact us extension. after installation. extension not work and when i login into system as admin. it showing me this error.
I resolved this. Actually, in Openlitespeed server there is required to setup virtual host and set the root directory "public" in the Laravel application. I did that and its worked.
I've already read online that even others have had the same problem and they say that is due to "custom theme active". But the problem is that I do not use a custom theme, I'm using only the default one.