Problem: Fatal error: Call to undefined function hook_taxonomy_title_before() in

Hello,

I have a realy problem. I make the update to tha last version of this theme, but i wanted to back-up. After back-up all the files and data base, when i acces one category, i receive this error:

Fatal error: Call to undefined function hook_taxonomy_title_before() in /home/firmero/public_html/turism365.com/wp-content/themes/DT/taxonomy.php on line 38

You can see the error here:
https://www.turism365.com/categoria/revelion-2016/

I jus check the taxonomy plugin and all luke fine. I don’t understend where can be the problem.