Bug: The sketchbook page crashed also provide an error page

[mehedihasan2810]

Description

The sketchbook page crashed due to an error.

The error in the console -

ReferenceError: loggedIn is not defined

Also, provide an error page UI in order that users can see an error page with some instructions on what they should do instead of being left out with a blank crashed page

Proposed Solution

Check in the sketchbook page if there's any var named loggedIn or if it's a typo. Solve it accordingly

Screenshots

No response

Browser 🥦

Google Chrome

Checklist ✅

• [X] I checked and didn't find similar issue
• [X] I have read the Contributing Guidelines
• [X] I am willing to work on this issue (leave this unchecked for no).

[mehedihasan2810]

@ItsRoy69 I'm going to make the PR ASAP as this is urgent