Web Tours Script Replay Failing

I get "Error -27979: Requested form not found, Snapshot Info [MSH 1 6]   [MsgId: MERR-27979]" while playing back the Web Tours script. Its failing at the below step. Please help.

web_submit_form("reservations.pl_2",
        "Snapshot=t5.inf",
        ITEMDATA,
        "Name=outboundFlight", "Value=030;251;05/01/2016", ENDITEM,
        "Name=reserveFlights.x", "Value=27", ENDITEM,
        "Name=reserveFlights.y", "Value=5", ENDITEM,
        LAST);

Thanks.