Wordpress header collapsed? I cannot enter wordpress control panel.

Web page shows strange strings and some other page shows following message.

OOOOOOOOOOOOOOOOOOOOOOOOOOO Warning: Cannot modify header information - headers already sent by (output started at /srv/users/serverpilot/apps/acewebwp02/public/wp-content/themes/dt-the7/functions.php:1) in /srv/users/serverpilot/apps/acewebwp02/public/wp-includes/pluggable.php on line 1228

Also I cannot enter wordpress control panel. Does anyone has any suggestion to fix?

Best regards,


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Check for spaces and tabs at the top in function.php for starts.