Blog problems with themforest

Hi I have the edu theme of Themeforest. I am trying to work with the blog and on the top of each entry there is a strange message like this: Warning: Cannot modify header information - headers already sent by (output started at /home/lagedaniela/public_html/wp-content/themes/education-theme/single.php:1) in /home/lagedaniela/public_html/wp-content/themes/education-theme/functions.php on line 1584

Can you please help me?

Hello. Have you tried clicking on that item’s support tab? It can be found here.

Please follow the instructions provided in the link above to interact directly with the author, where they may be able to point you in the right direction. Thanks!