I was testing an installation of Cocoon 2, Tomcat 3.2.1, Xalan 2.0.D06, Xerces 1.2.3, and Windows 2000. I only came accross this error using the Netscape 4.75--I did not get this error with Mozilla 0.6+ or with InternetExplorer. As I am not subscribed to this list, please copy my directly (Pier Fumagalli is approving it for me) with any resolution. When Tomcat can't find a Mime-Type, it fails with a NullPointerException that gets propogated back up to Cocoon--and Cocoon renders the error page. The Stack Trace says that it occurs with readers: java.lang.NullPointerException at org.apache.tomcat.util.MimeMap.getExtension(MimeMap.java:195) at org.apache.tomcat.util.MimeMap.getContentTypeFor(MimeMap.java:213) at org.apache.tomcat.facade.ServletContextFacade.getMimeType(ServletContextFacade.java:132) at org.apache.cocoon.reading.ResourceReader.getMimeType(ResourceReader.java:13 at .... (Tomcat 3.2.1, Cocoon 2 [1/23/2001 14:00:00], Xalan2-D06.jar) --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED]