First, try launching a miner manually (start button on the price grid).  If it doesn't start then you have a config error causing the miner to go dead.

Best guess is an error in your conf file.  If you provide a copy of it I can take a look.  Most likely you are not getting any valid miner entries from the file so trying to determine the best paying algo throws an error.

Try running with the sample conf file bundled with the executable.  Put in your Bitcoin address and TMB key.  Start modifying from there to put your own miner information in.