Issues when playing loadrunner nca script

I run into the following error when playing back my loadrunner script:

Action.c(148): nca_set_window("TKE Worksheet Entry")
Action.c(152): Error: nca_edit_set("277","slayton") failed, Window or object is not displayed.
The window currently in focus: "Error".
The last popup/alert message received: "stop - Cannot complete applications logon. You may have entered an invalid applications password, or there may have been a database connect error."
Abort was called from an action.

it seems my script works fine until the oracle form is displayed and does not recognize it. I have tried correlating the icx_ticket value but the correlation also does not work. Any suggestions/pointers are highly appreciated.

Thanks

ATS