Footer errors: Warning: Cannot modify header information – headers already sent

Hello @carolinainbound

I hope you’re well today!

I could only test it with a Lite version of the booking plugin and I can’t replicate that issue on my test site with it.

I do think, though, that this is specific to the site. The error suggests that the related cached file might be corrupted or there’s some specific cache conflict. Have you tried to clear Hummingbird’s Page Cache already? If not, could you give it a try?

If that doesn’t help, could you please try adding this line to the “wp-config.php” file of your site, right above the “/* That’s all, stop editing! */”:

define( 'WPMU_SENDFILE', true );

After adding that line, clear Page Cache again and see if it solves the problem. In case it didn’t help and/or broke the site – please remove the line and clear or disable Page Cache in Hummingbird and let us know here.

Best regards,
Adam