Picture preview not working

Hi everyone.

When I´m using the android version 2.2.14 and want to preview a picture without downloading I´m getting an error screen (pic with the exclamation mark)
I´ve tried to reinstall it, but got the same fault.
Any ideas ?

What´s going on ?
Nobody an idea why Android app is not working ?

Ok, I´ve found the fault.
Because my seafile is running in a VM, I forgot the routed port in SERVICE_URL and FILE_SERVER_ROOT.
Now thumbnails and Up-/Download are working !