Error: lrdo_logon: "OCILogon" return-code=OCI_ERROR, error-code=12154 Oracle 2-tier protocol

Hi,

I have recorded a business flow for HP Assest manager application using Oracle 2-tier protocol, and after replaying, getting the below error,

vuser_init.c(15): Error: lrdo_logon: "OCILogon" return-code=OCI_ERROR, error-code=12154:
vuser_init.c(15): Error: ORA-12154: TNS:could not resolve the connect identifier specified
vuser_init.c(15): lrd_logon: ERROR, return-code=LRDE2009. EnvHandle=OraEnv1, SvcCtxHandle=&OraSvc1, User="a", ServerID="A"

This error has been encountered by couple of folks before, and as such no solution is posted on forum to resolve this.

Related link: http://h30499.www3.hp.com/t5/LoadRunner-Support-Forum/Error-lrdo-server-attach-quot-OCIServerAttach-quot-return-code/td-p/5960717

Can anyone suggest the solution for this?

Thanks,

Ajit