Unable to view the output of the report

Unable to view the output of the report.The output of the request is pasted below for your reference:


 <?xml version="1.0" encoding="UTF-8" ?>
- <!--  Generated by Oracle Reports version 6.0.8.28.0
 -->
- <TPCPO_1>
 <LIST_G_PO_HEADER_ID />
 <CP_OPTION>GENERAL</CP_OPTION>
 </TPCPO_1>


Log file:

+---------------------------------------------------------------------------+
Purchasing: Version : 11.5.0 - Development

Copyright (c) 1979, 1999, Oracle Corporation. All rights reserved.

TPCPO_XML module: TPCSED Purchase Order XML Report
+---------------------------------------------------------------------------+

Current system time is 23-NOV-2011 15:48:03

+---------------------------------------------------------------------------+


+-----------------------------
| Starting concurrent program execution...
+-----------------------------

Arguments
------------
PF_PURCHASE_ORDER_NUM='217700'
P_option='GENERAL'
------------

 XML_REPORTS_XENVIRONMENT is :
/u05/oracle/test/testora/8.0.6/guicommon6/tk60/admin/Tk2Motif_UTF8.rgb