cloud9, cannot link js file to ejs - javascript

I am new to server programming.
I cannot get the bootstrap js files to link to my ejs file. I am trying to link the js files to index.ejs.
I have this code:
<script src="jquery.min.js"></script>
<script src="popper.min.js"></script>
<script src="bootstrap.min.js"></script>
They are in the same original folder, so why doesn't this work?
Thanks for your help
Screenshot of the situation

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