OJS Cannot save announcement

Hello, my OJS suddenly cannot save a new announcement or when I edit it. After I click save button, the circel at bottom right corner keep spinning.

Please help


Hello @Ahmad_Syafii .

What does your log say?


@juanito thnks for your replay
where can I find the log inside Cpanel?

File not found [/home/u*****/public_html/403.shtml

this error shows on the log