Symbol lookup error starting rc5

[pipedreambomb]

Hi, apologies if this is me being stupid, I'm pretty new to compiling software before I run it! Or at least other people's software.

I just built and installed rc5 of 3.0.0 on Ubuntu 12.04 (and installed the latest libtorrent-rasterbar, so 0.16.1) and I now get this error when I try and run "qbittorrent" from the terminal:

qbittorrent: symbol lookup error: qbittorrent: undefined symbol: _ZN5boost4asio5error18get_netdb_categoryEv

Thanks, and sorry again if I'm being a noob.
George