Several errors

I just uploaded tthis theme, but I’me getting a lot of error messages:
1) When saving a post, I get:
Warning: Cannot modify header information – headers already sent by (output started at /home/content/19/7712319/html/test/wp-content/themes/columbus/blueprint/functions/tinymce_buttons.php:70) in /home/content/19/7712319/html/test/wp-admin/post.php on line 229

Warning: Cannot modify header information – headers already sent by (output started at /home/content/19/7712319/html/test/wp-content/themes/columbus/blueprint/functions/tinymce_buttons.php:70) in /home/content/19/7712319/html/test/wp-includes/pluggable.php on line 896

2) Front page:
Fatal error: Call to undefined function placester_post_slug() in /home/content/19/7712319/html/test/wp-content/themes/columbus/blueprint/functions/compatibility.php on line 238

What do yuo reckon could be the problem?

Thanks
Paula