Fatal error: Call to undefined method Owl\Finder::find_author_by_id() in /mnt/soby/wordpress/wp-content/themes/owl/lib/finder.php on line 35

Call Stack:
    0.0001     633920   1. {main}() /mnt/soby/wordpress/index.php:0
    0.0057    2447520   2. require('/mnt/soby/wordpress/wp-blog-header.php') /mnt/soby/wordpress/index.php:44
    0.0854    9084672   3. require_once('/mnt/soby/wordpress/wp-includes/template-loader.php') /mnt/soby/wordpress/wp-blog-header.php:16
    0.0893    9062152   4. include('/mnt/soby/wordpress/wp-content/themes/owl/templates/index.php') /mnt/soby/wordpress/wp-includes/template-loader.php:43
    0.0894    9062344   5. Theme::render() /mnt/soby/wordpress/wp-content/themes/owl/templates/index.php:15
    0.0896    9068472   6. Owl\Core\Template->render() /mnt/soby/wordpress/wp-content/themes/owl/lib/theme.php:851
    0.1043   10057496   7. H2o->render() /mnt/soby/wordpress/wp-content/themes/owl/lib/core/template.php:215
    0.2726   11248432   8. StreamWriter->close() /mnt/soby/wordpress/wp-content/themes/owl/frameworks/engines/h2o-php/h2o.php:167
    0.2730   11262688   9. Owl\Model->__toString() /mnt/soby/wordpress/wp-content/themes/owl/lib/model.php:0
    0.2730   11262768  10. Theme::render_object() /mnt/soby/wordpress/wp-content/themes/owl/lib/model.php:362
    0.2733   11263168  11. Theme::render_object_with_cache() /mnt/soby/wordpress/wp-content/themes/owl/lib/theme.php:779
    0.2734   11269136  12. Owl\Core\Template->render() /mnt/soby/wordpress/wp-content/themes/owl/lib/theme.php:795
    0.2791   11384848  13. H2o->render() /mnt/soby/wordpress/wp-content/themes/owl/lib/core/template.php:215
    0.2792   11388256  14. NodeList->render() /mnt/soby/wordpress/wp-content/themes/owl/frameworks/engines/h2o-php/h2o.php:166
    0.2806   11403016  15. VariableNode->render() /mnt/soby/wordpress/wp-content/themes/owl/frameworks/engines/h2o-php/h2o/nodes.php:28
    0.2806   11403016  16. H2o_Context->resolve() /mnt/soby/wordpress/wp-content/themes/owl/frameworks/engines/h2o-php/h2o/nodes.php:67
    0.2806   11403560  17. H2o_Context->getVariable() /mnt/soby/wordpress/wp-content/themes/owl/frameworks/engines/h2o-php/h2o/context.php:167
    0.2807   11405512  18. Owl\Relation->__get() /mnt/soby/wordpress/wp-content/themes/owl/lib/relation.php:0
    0.2807   11405512  19. Owl\Relation->collect() /mnt/soby/wordpress/wp-content/themes/owl/lib/relation.php:520
    0.2809   11407528  20. Owl\Model::find_by_id() /mnt/soby/wordpress/wp-content/themes/owl/lib/relation.php:312
    0.2809   11407880  21. Owl\Finder->find_one() /mnt/soby/wordpress/wp-content/themes/owl/lib/model.php:141