internal server error with php 7

[Briand]

Hi,
I can't update site to php7, I still have an error 500 !
I updated Plesk to 12.5 and then, install PHP 7 via Update and Upgrade => add component ...So, it did well
But now, if I try to set PHP 7 on my site, I have internal error and I can't get View the phpinfo() page, it return : Error: Unable to retrieve information about the PHP configuration
Logs says :
(104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
Premature end of script headers: __info0.php
I 've tried to test my script on a mutual shared host with php 7 set and it works fine !!
So, what I forgot to do , how to see if PHP 7 is completly installed, I saw on web to compiled for CGI or Fast-CGI !??? but , it's hard for a beginner .
Thanks for help, if someone know

 

[IgorG]

Try to repair configuration with

# plesk repair web

 

[Briand]

No more results ! still have 500 error and logs says:

(104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
Premature end of script headers: ........

Thanks