cannot log into dashboard

I cannot loginto the dashboard all of a sudden, I get error messages: When I go to the login page I get:
"Cannot modify header information - headers already sent by (output started at /home/xxxxxx/wp-content/themes/cloriatotheme/functions/theme-options.php:721) in /home/xxxxx/wp-includes/pluggable.php on line681

If I ignore that and try to login I get that again and also the following:
Warning: Cannot modify header information - headers already sent by (output started at /home/xxxxx/wp-content/themes/cloriatotheme/functions/theme-options.php:721) in /home/xxxxxx/wp-includes/pluggable.php on line881

Can you help please? I don't know if I have done something wrong to cause this.

 

Hello again, please ignore the above request. I solved my problem by downloading the theme again and using the theme_options.php that was in that. I mut have done something wrong when I was attempting to add another slider.