Uncaught SystaxError: Unexpected Token ‘<'

Hello I have this very old application made in Vue 2 and everything was working fine but just today, I am experiencing this error: Uncaught SystaxError: Unexpected Token '<'.

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When I click the link, it returns an HTML file, the index file of my project:

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So to check, I tried to build npm run build the project locally. Upon checking on the generated files, the file returns a proper script file.
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I also tried to run the project on docker locally, and it was working fine. I tried the usually answer publicPath: '/' but it does not work on my issue.

Can somebody tell what is wrong with my project build?