Windows 10 client 7.2 showing 'Failed to index file'

Hello,
i have this issue, the 7.2 client showing ‘Failed to index file’.
The Server is Centos 7 with Seafile 7.0.8 pro.
https://imgur.com/sbHkVsB
The log file does not mention anything relevant…
Is this bug?

You should look at seafile.log. There should be some kind of error message.