[Hummingbird Pro] cache bug flush

Hi,
I have this error on all pages
Tried to purge cahce, changed a few setting but still …
thanks for your support.
M

Notice: ob_end_flush(): failed to send buffer of zlib output compression (1) in /home/clients/2127fa541afd65d6313ec86de797beda/marelle/wp-includes/functions.php on line 4339

Notice: ob_end_flush(): failed to send buffer of zlib output compression (1) in /home/clients/2127fa541afd65d6313ec86de797beda/marelle/wp-includes/functions.php on line 4339

Notice: ob_end_flush(): failed to send buffer of zlib output compression (1) in /home/clients/2127fa541afd65d6313ec86de797beda/marelle/wp-content/plugins/really-simple-ssl/class-mixed-content-fixer.php on line 111