Jupyter Notebook malfunctioning

I am running Julia and Python on Jupyter notebook. I like the UI and the auto indentation and other features (I'm a beginner). However, while running Julia today the entire notebook just appears blank. The code blocks are not colour coded, and there is no auto indentation. However, when I open a Python notebook/change the kernel from Julia to Python, it works as usual. I have attached pictures here for comparison.

I don't know what has changed. How do I fix this?

How many English words
do you know?
Test your English vocabulary size, and measure
how many words do you know
Online Test
Powered by Examplum