internal server error

Hello,

when activating wordfence plugin, I get the internal error (500) so frequently when accessing the website backend.

For now, I desactivated the plugin.

The following part of code is a sample of errors log file that I share to correct the bug:

[Mon Nov 21 08:45:50.978532 2016] [fcgid:warn] [pid 16968] (104)Connection reset by peer: [client 41.224.72.102:54736] mod_fcgid: ap_pass_brigade failed in handle_request_ipc function, referer: https://oasis-des-sciences.tn/wp-admin/admin.php?page=galleries_bwg
[Mon Nov 21 08:45:51.736263 2016] [fcgid:warn] [pid 16880] (104)Connection reset by peer: [client 41.224.72.102:54738] mod_fcgid: error reading data from FastCGI server, referer: https://oasis-des-sciences.tn/wp-admin/admin.php?page=galleries_bwg
[Mon Nov 21 08:45:51.736386 2016] [core:error] [pid 16880] [client 41.224.72.102:54738] End of script output before headers: admin.php, referer: https://oasis-des-sciences.tn/wp-admin/admin.php?page=galleries_bwg
[Mon Nov 21 08:45:54.330098 2016] [fcgid:warn] [pid 17214] (104)Connection reset by peer: [client 41.224.72.102:54749] mod_fcgid: error reading data from FastCGI server, referer: https://oasis-des-sciences.tn/wp-admin/post.php?post=1274&action=edit
[Mon Nov 21 08:45:54.330265 2016] [core:error] [pid 17214] [client 41.224.72.102:54749] End of script output before headers: admin.php, referer: https://oasis-des-sciences.tn/wp-admin/post.php?post=1274&action=edit
[Mon Nov 21 08:46:02.906553 2016] [fcgid:warn] [pid 17187] (104)Connection reset by peer: [client 41.224.72.102:54768] mod_fcgid: error reading data from FastCGI server, referer: https://oasis-des-sciences.tn/wp-admin/post.php?post=1274&action=edit
[Mon Nov 21 08:46:02.906740 2016] [core:error] [pid 17187] [client 41.224.72.102:54768] End of script output before headers: admin.php, referer: https://oasis-des-sciences.tn/wp-admin/post.php?post=1274&action=edit

note that the installed plugin is the latest update.