Unable to lock files on fresh install


I am new to SeaFile. I am having a great experience discovering all the features and testing the speed. I recently ran into a problem. I cannot lock files.

I want to test the locking files feature but it doesn´t work on my install. It is a fresh Ubuntu Server install, and I installed SeaFile using the script. I have a windows 10 client installed. I uploaded a simple excel file. When I try to lock it, I get a popup saying “Failed to lock file: server error”.

Any ideas on how to fix this?

thanks in advance!