problems running osmo_sgsn

Hi, I have git clone the openbsc program and encountered problem running osmo_sgsn, got the following error messages: " There is no such command. Error occurred during reading below line: nsip local port 23000 Failed to parse the config file: 'osmo-sgsn.cfg' <0014> sgsn_main.c : 170 Cannot parse config file. " Appreciate help on this. Thanks Ken