Error: the communication with Picasa Web Albums didn’t go as expected. Here’s what Picasa Web Albums said:
404. That’s an error.
The requested URL /data/feed/api/user/martin.lembard%40gmail.com/album/Oslava2550?kind=photo&authkey=Gv1sRgCL-3nred4Y-HpgE was not found on this server. That’s all we know.