Core: Create error message window box

[Aaditya019Jain]

Is your feature request related to a problem? Please describe.
The problem is on some pages which include a form or fields where we have to send data to the backend there if we enter a wrong entry or give less data the site crashes.

Describe the solution you'd like
The page should be coded such that when such a situation appears a pop window with the template same as that of the website should appear displaying the error message or a solution to the problem

Describe alternatives you've considered
NA

Additional context