Piwik couldn't write to some directories.
Try to Execute the following commands on your Linux server:
chmod 777 /var/www/vhosts/svpmail/httpdocs/svp_analyzer/tmp
chmod 777 /var/www/vhosts/svpmail/httpdocs/svp_analyzer/tmp/templates_c
chmod 777 /var/www/vhosts/svpmail/httpdocs/svp_analyzer/tmp/cache
If this doesn't work, you can try to create the directories with your FTP software, and set the CHMOD to 777 (with your FTP software, right click on the directories, permissions).
After applying the modifications, you can refresh the page.
If you need more help, try Piwik.org.