Yeah I’m having this same problem now… I think it has to do with having output buffering turned off.
Alright, if you are a little technically savvy I think I found the fix. You need to get to the main.php file ( either through the WP dashboard or via FTP ) and open it.
The first thing you’ll want to do is remove the space before the leading <?php tag. Make sure that <?php is flush up against the left side. Then you’ll want to scroll to the bottom and make sure you delete all of the blank lines after the closing ?> tag. Basically you want to eliminate all white space before <?php and after ?>.
If you don’t see a space or your main.php looks different than I’m describing, you probably are having a different issue.
Good luck!