We’ve a major issue in our main intranet portal. It’s down with a lot of errors that were not fixed by investigating on event viewer and ULS logs.
However, I’ve restored the content database to a date before the incident, but still the same issue was happening. So I created a new web app in the same farm and attached the main content database to it, but still I’m getting some errors as shown below:
The central admin is working fine, but the web app is down, and they are on the same server.
The original web app name (which is down) is: http://sp-l1
The new web app that I created and attached the db to it is: http://sp-l1:8080
Here is the error I’m getting when open the site:
Sorry, something went wrong
Unknown server tag 'dev:datetimelabel'.
Correlation ID: cef1ea9e-da03-0010-814b-70100b22910d
When I search for the ID in the ULS logs, I get the below: