Am now on 2.3
Just tried it with the same result. The initial access to the web interface after a fresh start (fresh install on an SD card on a Pi2), on the initial boot, resulted in the '500' error. This time all I did was disconnect the lan cable, and plug it back in and it was fine.
After that , I ran through all the initial setup stuff and am receiving files.
It looks like an issue with the first initialization of the LAN interface.