Error at top of my webpage?

Can anyone help me fix this issue
Txt on my website at top of page

Warning : Missing argument 1 for avia_font_manager::load_font(), called in /var/sites/s/ on line 488 and defined in /var/sites/s/ on line 452

Warning : include(/var/sites/s/ failed to open stream: No such file or directory in /var/sites/s/ on line 430

Warning : include(): Failed opening ‘/var/sites/s/’ for inclusion (include_path=’.:/usr/local/php-5.6.37-flock/lib/php’) in /var/sites/s/ on line 430


You can contact with your purchase item author hope they will help you in this issue