I had the same problem, I can't acces the stats page.
First I had to set the correct date:
[minepeon@minepeon ~]$ date
Thu Jan 1 01:11:24 BST 1970
[minepeon@minepeon ~]$ sudo date --set="30 May 2013 17:07"
[sudo] password for minepeon:
Thu May 30 17:07:00 BST 2013
At least a had to create the file /opt/minepeon/var/rrd/hashrate.rrd
[minepeon@minepeon dev]$ touch /opt/minepeon/var/rrd/hashrate.rrd
Now I can access the stats page.
But, my Raspberry don't discover my USB Block Erupter. Any idea?
I tried your solution with beta 1 and I still can't get the
STATS option. Going to /miner.php, I get the same
Server Error. I did a reboot... same problem.
The website encountered an error while retrieving
https://192.168.10.117/miner.php. It may be down for maintenance or configured incorrectly.
Error code: 500