[SOLVED] [DM_API_E_BADATTRNAME]error: "Bad attribute name 'str

I am receiving the following error in my application:

Error Description: Failed to prepare the search result.

Error Message: [DM_API_E_BADATTRNAME]error: "Bad attribute name 'str_en' for document/object."

Technical trace details:

DfTypedObjectException:: THREAD: http-9082-Processor19; MSG: [DM_API_E_BADATTRNAME]error:  
"Bad attribute name 'str_en' for document/object."; ERRORCODE: 100; NEXT: null
    at com.documentum.fc.client.DfTypedObjectException.newBadAttrNameException(DfTypedObjectException.java:39)
    at com.documentum.fc.client.DfType.getTypeAttr(DfType.java:282)
    at com.documentum.fc.client.DfType.getTypeAttrDataType(DfType.java:131) 
    at com.documentum.fc.client.DfType___PROXY.getTypeAttrDataType(DfType___PROXY.java)
    at se.project.osi.util.dfc.OsiType.getTypeAttrDataType(OsiType.java:630)
    at org.apache.jsp.portal.administration.equipment.resultset_jsp._jspService(resultset_jsp.java:342)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
    at se.filter.LoginFilter.doFilter(LoginFilter.java:55)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
    at se.filter.EncodingFilter.doFilter(EncodingFilter.java:33)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
    at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
    at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
    at java.lang.Thread.run(Thread.java:595)

The error only started when I recently upgraded dfc to version 6.7 (sp1) from 5.3 (sp6). I am running everything locally. My 5.3 (sp6) version still works fine, but I am wondering what can cause the error even though they run on the same docbase, the same application (except for dfc changes) and against the same server.

Here is a code snippet of result.jsp which should display the search:

<%
java.util.Collection col = null;
se.project.osi.util.dfc.OsiDQL q = new se.project.osi.util.dfc.OsiDQL(org.apache.commons.logging.LogFactory.getLog(this.getClass()));
q.setDQL("select str_en from osi_localized where str_category = 'Title'");

col = q.toCollectionString();
java.util.Iterator it = col.iterator();
while(it.hasNext()){
  out.println((String) it.next()+ "<br>");
}
%>

And also search.jsp:

    <%

try {
  queryBean.parse(request, "");
  queryBean.doAction(request, "");

  // Get the Query Mgr Model
  OsiQueryMgrModel model = (OsiQueryMgrModel) session.getAttribute(IProjectType.MODEL_SEARCH_CONTENT);
  String onSubmit = "";
  if (model == null) {
    // Create new Query Mgr Model
    model = new OsiQueryMgrModel();
  }

  if(request.getParameter("osi_localized.str_en") != null)
    onSubmit = "onLoad=\"parent.resultview.location.href = '" + 
        request.getContextPath() + "/portal/administration/material/resultset.jsp?run=T';\"";

  // Assign the updated QueryMgr
  model.setQueryMgr(queryBean.getQueryMgr());
  session.setAttribute(IProjectType.MODEL_SEARCH_CONTENT, model);
%>

Thank you in advance,