When I imported the database onto another server, everything was fine. but when I try to approve the data set from the approval app, the period list does not appear.
It looks like you have not selected a Data set in the screenshot above. Do you see the periods after you select the data set?
I am so sorry for confusing you. I have checked catalona and I found that we have to give permission chown to “dhis/ home/dhis/conf/file”.