Server Error

How to fix this error, Screenshot attached
Errpr

Need a bit more info. What’s the URL, and enable error reporting (errors.display in system.yaml) to show a more meaningful error

I am trying to add new plugin via admin panel, there’s is also a strange error saying internet server error in every page load in admin panel. I have enabled display error, here it is : Untitled

Do you have CURL enabled on the server?