No errors but no styles being applied

[lewishackfath]

I am using this version of the skin:
https://github.com/borkweb/bootstrap-mediawiki/tree/d09ca2920ca43db6c2373f0bd82ae3eef9f627a8
with mediawiki version 1.30

I am not getting any php errors.
I get the following console error:

ReferenceError: addOnloadHook is not defined[Learn More]
index.php:4:765

My page displays with no styling at all.

[ThirdGen]

Experiencing the same issue after upgrading to MediaWiki 1.31.0. Styling no longer being applied and no PHP errors are present.

Using the same branch as noted by the original poster as the main branch has yet to be updated for the functions that were deprecated back in MW version 1.21. This theme has been an incredibly clean and minimal theme, it is a shame it doesn't get the attention it deserves.