Null Pointer Exception on Install.jsp

[Jerry Malcolm <2n...@gmail.com>]

I'm trying to install JSPWiki for the first time.  The install steps
are pretty basic.... download the WAR and put it in webapps.  Run
Install.jsp....

I've tried it on two different servers that I own.  On both servers, I
get:a null pointer exception (see info below).

Kinda hard to mess up two simple steps.  But apparently I'm missing
something.  What am I doing wrong?

Thanks.

Jerry

org.apache.jasper.JasperException: An exception occurred processing
JSP page /Install.jsp at line 46

43: WikiSession wikiSession = wikiContext.getWikiSession();
44:
45: // Parse the existing properties
46: installer.parseProperties();
47: boolean validated = false;
48: String password = null;
49: ResourceBundle rb = Preferences.getBundle( wikiContext, "CoreResources" );


Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.apache.wiki.ui.WikiServletFilter.doFilter(WikiServletFilter.java:177)
org.apache.wiki.ui.WikiJSPFilter.doFilter(WikiJSPFilter.java:121)