can't start bitcoin-miner std::runtime_error

[daemon_sid]

Hi everybody
I try to start bitcoin-miner and get message:
terminate called after throwing an instance of 'std::runtime_error'
  what():  locale::facet::_S_create_c_locale name not valid
Aborted

distr: Ubuntu 9.04
gcc version 4.5.0
LANG=en_US.UTF-8

Where can be a problem?

[daemon_sid]

The problem is solved with export LANG=C