error install openbsc

Hi all I am installing OpenBSC.I just following http://openbsc.osmocom.org/trac/wiki/Building_OpenBSC (I am just Building libosmocore, Building libosmo-abis, Building libosmo-netif, Building OpenBSC and install library.) But when I tried to run OpenBSC,I encounter with this error(problem). user12@ubuntu:~$ cd '/home/user12/openbsc/openbsc/src/osmo-nitb' user12@ubuntu:~/openbsc/openbsc/src/osmo-nitb$ sudo ./osmo-nitb <0005> bsc_init.c:492 Failed to parse the config file: 'openbsc.cfg' Or how do I run the software(OpenBSC)! Or do I have to install something missing? Note: My Linux is version ubuntu 12.04 . Please help me. thank you.