Github public site with Jekyll does not update anymore

Question

Excuse me again for seeking help for my site at meredithhu.github.io.

All the codes are here: https://github.com/meredithhu/meredithhu.github.io.

As you can see the updated codes never get updated any more, for instance, the About page here https://github.com/meredithhu/meredithhu.github.io/About never gets updated according to my most recent changes in codes: https://github.com/meredithhu/meredithhu.github.io/blob/master/About/index.html

The same goes for my Reseach/Misc/Memo pages...

Could anyone give me some hints how to fix the problem?

Answer 1

This is the error you should address: Liquid Exception: Invalid Date: 'nil' is not a valid datetime. in /_layouts/blog.html.

You should use {{ page.date | date_to_string }} only if page.date is a valid date, so you can check if it is not nil updating _layouts/blog.html:

{%if page.date%}
 <p class="meta">{{ page.date | date_to_string }}</p>
{%endif%}