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White page in Joomla Preview

Hello,

Make sure that the PHP version set for this website is higher than 5.3.3.
Make sure that the theme for this website is not corrupted(change to other one)
Check website's error log for errors.
 
Hello thank for answers. Actually no errors in syslog file.

The version of php is higher than 5.3.3 actually. Only the administrator of joomla don't work in the preview. Without preview the Administrator work perfectly.
 
Not syslog. Domain's log file located in /var/www/vhosts/system/domain_name/logs/error_log

Also check is it working while visiting the website directly, not from preview.
 
Done but change nothing to the preview.

For information the preview bug on all domains. (Only on joomla , wordpress admin work)
 
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