I tried yesterday, with phd restart and it doesn't work. it restarted the daemon, but on web the issue still exists. Then I restart the whole server and the problem is still the same. Today when I wake up, I restart the server again. Magically the problem solved. I don't know what's happening here but I will close this question for now. Thanks avivey for your help here.

This is strange. After you mentioned daemon, I log into the admin account and see an issue about daemons not running. However, when I ssh to server and run the demon, it told me that demon is already running...

Thank you so much for giving me help here. Have a nice weekend. @avivey

Wow, that's great.

Thank you so much for the help. Now it works.

wow, thank you so much for the detailed answer. So much appreciated.

Thanks. That works.