Counter: This code snippet just counts your jekyll posts and spits out the result

jeykll-post-counter.liquid

{% comment %}
*
*   Counter: This include counts your jekyll posts
*
{% endcomment %}{% assign counter = 0 %}{% for item in site.posts %}{% unless item.published == false %}{% assign counter=counter | plus:1 %}{% endunless %}{% endfor %}{{ counter }}

must be:

{% assign counter = 0 %}

must be:

{% assign counter = 0 %}

You're right :) Thankyou!