What does: "XSLT Error (javax.xml.transform.TransformerException): org.apache.xml.dtm.DTMException: No more DTM IDs are available" mean?

It means you are probably using a very old version of Xalan or Xalan-Java, likely the version 2.2D11 which was packaged in JDK1.4. Architectural changes made in early 2002 should have eliminated this issue for almost all cases.