Why doesn't the Class Odnoklassniki button work for the site's internal pages?

Question

Classmates

Good afternoon!
Site sfedu.ru. I make a button according to the instructions https://apiok.ru/ext/like Either as a button or just as a link. In any case, when sharing the internal pages of the site (for example, sfedu.ru/news/53090), it gives the error "Links of this type are not supported." At the same time, the main page sfedu.ru "rummages" normally.
Please tell me what could be the matter?

Answer 1

Today I also caught such an error in our blog https://courseburg.ru/news/kak_stat_konditerom-p93...
I fixed it by changing the API code
It was:
It became:

<a href="https://connect.ok.ru/offer?url=https://courseburg.ru/news/kak_stat_konditerom-p9308.html" title="" onclick="essb.window('https://connect.ok.ru/offer?url=https://courseburg.ru/news/kak_stat_konditerom-p9308.html','ok','276671941'); return false;" target="_blank" rel="nofollow"><span class="essb_icon essb_icon_ok"></span><span class="essb_network_name">Класс</span></a>