Warning when signing in via wp-admin

When I login to my wp-admin at http://www.alexruthmann.com/blog1/wp-admin/, I get the following Warning and cannot get into my dashboard: Warning: Cannot modify header information - headers already sent by (output started at /home/content/s/r/u/sruthmann/html/blog1/wp-content/themes/simple-catch-pro/functions.php:1) in /home/content/s/r/u/sruthmann/html/blog1/wp-includes/pluggable.php on line 876 Can you help me figure out how to fix this?