Loadrunner playback error on Oracle NCA protocol

I am recording a basic script to login into Oracle 11i applicaiton. Goto the Sales Order form and book an order. I am recording script as Object names (record=names tagged at the end of nca_connect_server). During play back, I get the following errors.

Execution Log:
vuser_end.c(6): Error: nca_menu_select_item("Sales Orders","File;Close Form") failed, Window or object is disabled
Source Code:
nca_tab_select_item("ORDER_REGIONS", "Line Items");

and

Execution Log:
Action.c(54): Error: nca_tab_select_item("ORDER_REGIONS","Line Items") failed, Window or object is disabled
Source Code:
nca_tab_select_item("ORDER_REGIONS", "Line Items");

Can you please suggest what is the issue here?

Thanks

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