Hi Rakshith,
It could help if you would elaborate a little bit about what you are trying to achieve. But for what I can see, you haven't actually installed the crypto-js library. You can read how to do this here. You need to have npm installed and run the following code in your /actions folder:
npm i crypto-js
Mendix only has a limited out-of-the-box set of commands from Core JS and the Mozilla Fetch API (doc). Other libraries/functions need to be installed by yourself.
Hope this helps.