Catchable fatal error

Hi, how are you? Can you help me please?

I’m installing my wordpress site with Travel WP Theme and WPML in 3 languages (spanish, english and italian). When I try to add new entries for my blog I have this message error:

Catchable fatal error: Object of class WP_Term could not be converted to string in /home/guiaturi/public_html/wp-includes/taxonomy.php on line 2331

On line 2329-2331 of taxonomy.php I have this:

if ( $new_tt_ids )
wp_update_term_count( $new_tt_ids, $taxonomy );

if ( ! $append ) {
$delete_tt_ids = array_diff( $old_tt_ids, $tt_ids );

I’m trying to read about these error in the forum but there aren’t other posts with this Catchable error and I can’t understand what is the error.

The domain is: https://www.guiaturisticosevilla.com
Thanks in advance,

Regards,

Ricardo