java.lang.NullPointerException in xml data template in BI Publisher in R12.1.3

Hi All,

I am doing XML data template in BI Publisher

[011017_083218832][][STATEMENT] Start process Data

[011017_083218833][][STATEMENT] Process Data ...

[011017_083218840][][STATEMENT] Executing data triggers...

[011017_083218840][][STATEMENT] BEGIN

XXCINVXML.P_TRX_NUMBER_LOW := :P_TRX_NUMBER_LOW ;

XXCINVXML.P_TRX_NUMBER_HIGH := :P_TRX_NUMBER_HIGH ;

XXCINVXML.YES := :YES ;

XXCINVXML.NO := :NO ;

XXCINVXML.P_MSG_PRINTING_OPTION := :P_MSG_PRINTING_OPTION ;

XXCINVXML.P_MSG_SHIPPING := :P_MSG_SHIPPING ;

XXCINVXML.P_MSG_TAX := :P_MSG_TAX ;

XXCINVXML.P_MSG_LINE := :P_MSG_LINE ;

XXCINVXML.P_CHECK_FOR_TAXYN := :P_CHECK_FOR_TAXYN ;

XXCINVXML.P_CONC_REQUEST_ID := :P_CONC_REQUEST_ID ;

XXCINVXML.PP_AMOUNT := :PP_AMOUNT ;