error when installing zend opcache

Hello Guys
Hope someone can help me
I'm using ispconfig 3 on debian 6 server with php 5.3.3
I'm running a prestashop website with fast cgi and suexec

In order to speed up the website I tried to install zend opcache like this :
-pecl install zendopcache-7.0.2
then I created a file opcache.ini on /etc/php5/conf.d with this config :

zend_extension=/usr/lib/php5/20100525/opcache.so (changed with my config)
opcache.memory_consumption=128
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=4000
opcache.revalidate_freq=60
opcache.fast_shutdown=1
opcache.enable_cli=1

but when I tried to access to mywebsite I have this error

(104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[Sun Jan 10 13:07:52 2016] [error] [client xx.xx.xx.xx] Premature end of script headers: index.php

Thanks a lot for your help guys

 

Thank you for your reply Till

when I installed zend opcache , I have this message at th end of the installation, do you think the problem may come from this message :

Warning: preg_match(): Delimiter must not be alphanumeric or backslash in PEAR/Command/Install.php on line 777
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /usr/share/php/PEAR/Command/Install.php on line 777

thank you

 

Hello guys
I think to problem came from here but I don't understand the signification
Build process completed successfully
Installing '/usr/lib/php5/20090626/opcache.so'
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in PEAR/Command/Install.php on line 777
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /usr/share/php/PEAR/Command/Install.php on line 777
when I check this line this is what I have :
$ts = preg_match('Thread Safety.+enabled', $info) ? '_ts' : '';
Thank you for your help

 

any help guys ?
so After installing opcache and put the path on opache.ini
everything seems to be fine
when I check with php -v , I don't have any error and it tells me that zend opcache is installed
But when I try to access to my website or ispconfig panel I have an error.
I check the logs this is what I have :
[warn] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[warn] (104)Connection reset by peer: mod_fcgid: ap_pass_brigade failed in handle_request_ipc function

Thank you for your help