help, site doesn’t work anymore, T STRING??????

help my site doesn’t work anymore after i did something in the post.php, now i replaced the file post.phop for the original but it still gives the next error:
Parse error: parse error, unexpected T_STRING in /var/www/vhosts/ditkannietwaarzijn.nl/httpdocs/wp-content/themes/3c-black-letterhead/post.php on line 1

don’t know what it is and what to do