Accessing /api/index.ftl throws an NPE

When accessing http://<host>/api/index.ftl

The following error is thrown:

Internal server error
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A system error has occurred - our apologies!

Please create a issue on our bug tracking system at http://jira.atlassian.com with the following information:

1. a description of your problem and what you were doing at the time it occurred
2. cut & paste the error and system information found below
3. attach the application server log file (if possible).

We will respond as promptly as possible.
Thank you!

Version: 0.8
Build: 120
Build Date: Dec 11, 2006

Stack Trace: java.lang.NullPointerException
at com.opensymphony.webwork.views.jsp.TagUtils.buildNamespace(TagUtils.java:88)
at com.opensymphony.webwork.components.Component.determineNamespace(Component.java:334)
at com.opensymphony.webwork.components.Component.determineActionURL(Component.java:316)
at com.opensymphony.webwork.components.URL.end(URL.java:208)
at com.opensymphony.webwork.views.freemarker.tags.CallbackWriter.afterBody(CallbackWriter.java:65)
at freemarker.core.Environment.visit(Environment.java:235)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:116)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.IfBlock.accept(IfBlock.java:82)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.Environment.include(Environment.java:1375)
at freemarker.core.Include.accept(Include.java:155)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.Environment.process(Environment.java:176)
at freemarker.template.Template.process(Template.java:232)
at com.atlassian.bamboo.ww2.FreemarkerRequestDispatcherPageFilter.applyDecorator(FreemarkerRequestDispatcherPageFilter.java:66)
at com.opensymphony.webwork.sitemesh.TemplatePageFilter.applyDecorator(TemplatePageFilter.java:86)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:59)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
at com.opensymphony.webwork.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:78)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
at com.atlassian.bamboo.filter.LicenseFilter.doFilter(LicenseFilter.java:71)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
at com.atlassian.johnson.filters.JohnsonFilter.doFilter(JohnsonFilter.java:91)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:182)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:177)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:823)
at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:473)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
at org.mortbay.jetty.plus.PlusWebAppContext.handle(PlusWebAppContext.java:158)
at org.mortbay.http.HttpServer.service(HttpServer.java:954)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)