Error in pin_in_doc_gen

Hi,

We are executing pin_inv_doc_gen for generating invoice using BIP-BRM integration. We have followed all the steps as mentioned in the Oracle doc

http://docs.oracle.com/cd/E16754_01/doc.75/e16707/inv_bip_11g.htm#CEGCIBED

But while executing docgen.sh, invoice has been generated but we are getting the below error

[pin@hjtddevbrmapp pin_inv_doc_gen]$ ./docgen.sh

Executing  /etc/alternatives/jdk1.7.0_60/bin/java invoicedocgen.pin_inv_doc_gen -status pending
java.lang.ClassCastException: weblogic.jdbc.common.internal.RmiDataSource_1035_WLStub cannot be cast to javax.sql.DataSource
        at invoicedocgen.ConnectSchedDB.getScheduleDBConnection(Unknown Source)
        at invoicedocgen.ConnectSchedDB.insertXMLPJobRecord(Unknown Source)