javascript console error for wiki pages

[mgage]

The error in the javascript console is:

The resource from “https://webwork.maa.org/mediawiki/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector” was blocked due to MIME type (“text/html”) mismatch (X-Content-Type-Options: nosniff).

This url:

https://webwork.maa.org/mediawiki/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector”

produced this error message

[Wed Mar 11 09:59:34.044327 2020] [php7:warn] [pid 1297] [client 8.9.87.87:60745] PHP Warning:  file_get_contents(/var/www/html/mediawiki/resources/src/startup/startup.js): failed to open stream: No such file or directory in /var/www/html/mediawiki/includes/resourceloader/ResourceLoaderStartUpModule.php on line 414
[Wed Mar 11 09:59:34.044448 2020] [php7:warn] [pid 1297] [client 8.9.87.87:60745] PHP Warning:  file_get_contents(/var/www/html/mediawiki/resources/src/startup/mediawiki.js): failed to open stream: No such file or directory in /var/www/html/mediawiki/includes/resourceloader/ResourceLoaderStartUpModule.php on line 418
[Wed Mar 11 09:59:34.044536 2020] [php7:warn] [pid 1297] [client 8.9.87.87:60745] PHP Warning:  file_get_contents(/var/www/html/mediawiki/resources/src/startup/mediawiki.requestIdleCallback.js): failed to open stream: No such file or directory in /var/www/html/mediawiki/includes/resourceloader/ResourceLoaderStartUpModule.php on line 419

I suspect we have a configuration error for the javascript directories in our setup of mediawiki.
Also we are missing the "startup" directory.

https://www.mediawiki.org/wiki/ResourceLoader/Architecture