PLS-00306: wrong number or types of arguments in call to 'INSERT_PO_SHIPMENT'

Hello,

Need help in using the PO API.Its giving Error :

PLS-00306: wrong number or types of arguments in call to 'INSERT_PO_SHIPMENT'

ORA-06550: line 81, column 1:

Below is the Autonomous Block which ran into Error:

declare

        X_row_id                     varchar2(32767);

        X_po_row_id                 varchar2(32767);

        X_line_location_id            number;

        X_valid_quantity_released   varchar2(32767) :=NULL;

        X_increment_rev             varchar2(32767) :=NULL;

        X_new_revision_num           number  :=NULL;

-- Bug 902976, zxzhang, 10/04/99

-- Change REVISED_DATE from VarChar(25) to Date.

--      X_revised_date                  varchar2(20),

        X_revised_date                   Date :=NULL;

        X_item_status                varchar2(32767) :=NULL;

        X_autocreated_dist          VARCHAR2(32767) :=NULL;

        X_destination_type_code      varchar2(32767) :=NULL;