Error during upgrading sap ERP 6.0 to EHP4

Hi all

i faced this error during upgrading sap netweaver 7.0 sr1 to EHP4 by EHPI tool:

ERROR:   The executable disp+work in D:\usr\sap\EHPI\abap\exe

         and/or D:\usr\sap\EHPI\abap\exenew

         is too old.

         It needs at least least patch level

         61 or higher.

         Please proceed as described in note 19466.

Please advice...

Thanks

Ahmed Helmy