Fixed php session save permission problem

CMS/Backend/Fpm-Pool.conf-unconfigured

@@ -5,6 +5,7 @@ listen = /var/run/php/phpPHPver-fpm-Backend.sock
 listen.owner = www-data
 listen.group = www-data
 php_admin_value[disable_functions] = exec,passthru,shell_exec,system
+php_value[session.save_path]    = /var/lib/php/sessions
 php_admin_value[opcache.enable] = 0      
 php_admin_value[max_input_vars] = 5000                                                                                                                                                                                                                                         
 php_admin_value[upload_max_filesize] = 256M                                                                                                                                                                                                                                    

CMS/Backend/conf.sh

@@ -3,6 +3,8 @@ curl --retry 7 --retry-delay 5 -s "$repo"/raw/"$branchtype"/"$branch"/CMS/Backen
 sed -i 's/PHPver/'$phpver'/' "$phpPoolDir"/Backend.conf
 groupadd Backend
 useradd -g Backend Backend
+usermod -a -G www-data Backend
+
 #PHPMyAdmin configuration
 touch /var/log/PhpMyAdmin/PhpMyAdmin_auth.log
 chown Backend:Backend -R /usr/share/phpmyadmin