java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.deuteriumlabs.dendrite.controller.SubmitRewriteController.getAuthorsOfAltPgs(SubmitRewriteController.java:71)
at com.deuteriumlabs.dendrite.controller.SubmitRewriteController.notifyAuthorsOfAltPgs(SubmitRewriteController.java:84)
at com.deuteriumlabs.dendrite.controller.SubmitRewriteController.buildStoryPage(SubmitRewriteController.java:34)
at com.deuteriumlabs.dendrite.controller.SubmitController.buildNewPage(SubmitController.java:78)
at com.deuteriumlabs.dendrite.controller.SubmitRewriteController.buildNewPage(SubmitRewriteController.java:18)
at com.deuteriumlabs.dendrite.controller.SubmitRewriteServlet.doPost(SubmitRewriteServlet.java:56)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)

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