Page Builder Issue 6.1.1

Hi Everyone,

I am trying to create new pages in page builder, and keep getting this error.

I can place blocks no problem and put all relevant info in the blocks, pictures, files etc  no problem, but when I view the page I get these errors:

Warning! The page not found in PageView cache.
Warning: Cannot modify header information - headers already sent by (output started at /xxxxx/xxxx/xxxxxxx/inc/classes/BxDolPageView.php:48) in /xxxxxx/xxxxxx/xxxxxxx/inc/design.inc.php on line 495

Anyone help???

Jeff