Hi Poul
Not sure where you're seeing the errors or copied the text from.
But easiest for me as follows and not sure if you've done this.
If the page loads , even with errors, then the page is found,
right click on the page in the browser and see the source lines for the script files
eg.
<link rel="stylesheet" type="text/css" href="
https://fonts.googleapis.com/css?family=Open+Sans:r,b" />
<script src="/scripts/modernizr.custom.js" type="text/javascript"></script>
<script src="/scripts/jquery-3.7.0.min.js" type="text/javascript"></script>
<script src="/scripts/jquery-ui-1.13.2.custom.min.js" type="text/javascript"></script>
if you click on the line, it should open the .JS file
otherwise check the location of the file
check your webfolder setting and where the app is loaded from
see attachment
c:\appfolder\webapp.exe
your web folder normally is in the same folder
c:\appfolder\web
and below that the script folder
c:\appfolder\web\scripts
regards
Johan