[BUG] Blank White Page on Clicking Challenges->CSS

[Sumonta056]

Describe the bug
Blank White Page on Clicking Challenges->CSS. Everything goes out just a white blank page which creates a situation to unable to access other things.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Challenges'
2. Click on 'CSS'
3. See error

Expected behavior
Even if there is no challenges in CSS , at least show the navbar to access other things

Screenshots

Desktop:

• OS: Window
• Browser: Microsoft Edge
• Version 116.0.1938.69 (Official build) (64-bit)

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