I’ve downgraded to 6.2.5 because I was unable to run Seafile 7.0.4, then everything seems back to normal, except I can’t create any library.
Here’s seahub.log entry
2019-08-11 15:45:11,671 [ERROR] seahub.api2.views:736 post Failed to add branch
My server runs on Ubuntu 16.04.6 LTS