DBMS_XMLQUERY.setXSLT gives NullPointerException

All,
I want to apply xsl file to xml and generate another xml. This xsl file is stored in database as clob data. So I select it first and call DBMS_XMLQUERY.setXSLT. But this method gives me "Java call terminated by uncaught Java exception: java.lang.NullPointerException" Do you know why? Please help!

• the following code is from pl/sql ----------------- select expMod.XSL_FILE_CONTENT INTO l_xsl_file_content FROM ams_exp_modified_template expMod, ams_exp_template seed WHERE (seed.export_type = l_export_type AND seed.exp_template_id = expMod.exp_template_id(+));

     DBMS_XMLQUERY.setXSLT(l_queryCtx, l_xsl_file_content);--Null Err
     l_xml_data := DBMS_XMLQuery.getXML(l_queryCtx);


------------------this is my xsl file -----------------------------










----------------this is my xml file  ------------------




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