connect to SAP

Hi...


I want use pentaho ba Server (Release:4.8.0 stable.51169) connect to SAP,
I have copy the sapjco3.jar to C:\Pentaho\biserver-ce-4.8.0-stable\biserver-ce\tomcat\lib
but
ERROR 20-12 09:20:32,675 - SAP Input (Insert table) - java.lang.NoClassDefFoundError: org/pentaho/di/trans/steps/sapinput/sap/impl/SAPConnectionImpl
at org.pentaho.di.trans.steps.sapinput.sap.SAPConnectionFactory.create(SAPConnectionFactory.java:44)


can some one please tell me what I am missing??


Thanks a lot in advance