Call_user_func_array() error


Hi!

I've been out for a while, and not working with webdesign at all for some time. But now I'm back, and just to find an issue I am not sure on how to solve, while updating a website.

The following error appears on top of pages:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'uk-flex' not found or invalid function name in /home/tupodesp/avalforma.pt/wp/wp-includes/class-wp-hook.php on line 286

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'data-uk-slideshow' not found or invalid function name in /home/tupodesp/avalforma.pt/wp/wp-includes/class-wp-hook.php on line 286

Any clues? Can someone help me with this?

Thanks in advance. Saul


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