Tag archive can't find my posts

When I click the tag, my tag archives only display the following message:

Not Found

Apologies, but no results were found for the requested archive. Perhaps searching will help find a related post.

http://ukrks.info/tag/zakonodavstvo
all was ok 3 weeks ago.

But all is correct for categories.

http://ukrks.info/category/statenews/ohlyad-zakonodavstva

[Moderator Note: Please ensure that you are embedding links correctly in your posts.]