radius server stops with error "segmentation fault"

Dear All, I have freeradius installed in RHEL4 with mysql database server. When I had basic configuration of radiusd.conf, the server was working fine. But when I made some changes in radiusd.conf file for checking user's data & time limit with sqlcounter & sqldatacounter, the server stops with error "segmentation fault" . Please help me in this regard. Thanks & Regards, Ravin