You want to export/save any "Report" from the SEP Manager, but when opening the exported file, "An unknown error occurred." is showing as error message.
SEPM version below 14.3 RU4 affected.
Issue within the "php.ini" file and the "include_path".
Upgrade to Symantec Endpoint Protection Manager 14.3 RU4.
Contact support if upgrade is not an option.