Parse error

Hi, For no apparent reason, I am getting an error... Parse error: syntax error, unexpected '<' in /home/content/81/10855681/html/n332/wp-content/themes/catch-base/header.php on line 83 I have tried disabling all plugins but no different. Other themes working fine too. Nothing changed as far as I am aware, but now the site doesn´t work :( Any advice???? Thanks.