Error Apache / suPHP

Hi, have an error log with Apache / SuPHP

[Wed Jan 18 06:43:06 2017] [error] [client 2.2.239.135] SoftException in Application.cpp:567: Directory "/home/hide/public_html/web" is writeable by group
[Wed Jan 18 06:43:06 2017] [error] [client 2.2.239.135] Premature end of script headers: app.php
[Wed Jan 18 06:53:24 2017] [error] [client 2.2.239.135] SoftException in Application.cpp:567: Directory "/home/hide/public_html/web" is writeable by group
[Wed Jan 18 06:53:24 2017] [error] [client 2.2.239.135] Premature end of script headers: app.php


Thanks for help and best regards

More log and another new log with clean installation

[Wed Jan 18 10:13:00 2017] [error] [client 2.2.239.135] SoftException in Application.cpp:249: File "/home/hide/public_html/web/app.php" is writeable by group, referer: http://suika.eu/
[Wed Jan 18 10:13:00 2017] [error] [client 2.2.239.135] Premature end of script headers: app.php, referer: http://suika.eu/
[Wed Jan 18 10:13:01 2017] [error] [client 2.2.239.135] SoftException in Application.cpp:249: File "/home/hide/public_html/web/app.php" is writeable by group
[Wed Jan 18 10:13:01 2017] [error] [client 2.2.239.135] Premature end of script headers: app.php


Thanks Symfony and SuPHP