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via GitHub by chen-regen
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java.lang.NullPointerException: 	at edu.isi.karma.view.VWorksheet.addHeaderViewPath(VWorksheet.java:383)	at edu.isi.karma.view.VWorksheet.updateHeaderViewNodes(VWorksheet.java:364)	at edu.isi.karma.view.ViewFactory.updateWorksheet(ViewFactory.java:93)	at edu.isi.karma.controller.update.RegenerateWorksheetUpdate.applyUpdate(RegenerateWorksheetUpdate.java:61)	at edu.isi.karma.controller.update.UpdateContainer.applyUpdates(UpdateContainer.java:100)	at edu.isi.karma.webserver.RequestController.doPost(RequestController.java:103)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:698)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:505)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:138)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:564)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:213)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1096)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:432)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:175)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1030)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:201)	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)	at org.eclipse.jetty.server.Server.handle(Server.java:445)	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:268)	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:229)	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:358)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:601)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:532)	at java.lang.Thread.run(Thread.java:745)