Error 500 Server Error

HTTP ERROR 500

Problem accessing /studio/. Reason:

    Server Error

Caused by:

javax.servlet.ServletException: com.vaadin.server.ServiceException: java.lang.NullPointerException
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:386)
	at com.haulmont.studio.ui.app.aL.service(SourceFile:90)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
	at org.eclipse.jetty.server.Server.handle(Server.java:499)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:258)
	at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Thread.java:745)
Caused by: com.vaadin.server.ServiceException: java.lang.NullPointerException
	at com.vaadin.server.VaadinService.handleExceptionDuringRequest(VaadinService.java:1474)
	at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1434)
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:384)
	... 20 more
Caused by: java.lang.NullPointerException
	at com.vaadin.ui.Table.findNumRowsToPaint(Table.java:3879)
	at com.vaadin.ui.Table.doPaintContent(Table.java:3377)
	at com.vaadin.ui.Table.paintContent(Table.java:3363)
	at com.vaadin.server.LegacyPaint.paint(LegacyPaint.java:65)
	at com.vaadin.server.communication.LegacyUidlWriter.write(LegacyUidlWriter.java:82)
	at com.vaadin.server.communication.UidlWriter.write(UidlWriter.java:143)
	at com.vaadin.server.communication.UIInitHandler.getInitialUidl(UIInitHandler.java:293)
	at com.vaadin.server.communication.UIInitHandler.synchronizedHandleRequest(UIInitHandler.java:80)
	at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
	at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1422)
	... 21 more

Caused by:

com.vaadin.server.ServiceException: java.lang.NullPointerException
	at com.vaadin.server.VaadinService.handleExceptionDuringRequest(VaadinService.java:1474)
	at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1434)
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:384)
	at com.haulmont.studio.ui.app.aL.service(SourceFile:90)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
	at org.eclipse.jetty.server.Server.handle(Server.java:499)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:258)
	at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at com.vaadin.ui.Table.findNumRowsToPaint(Table.java:3879)
	at com.vaadin.ui.Table.doPaintContent(Table.java:3377)
	at com.vaadin.ui.Table.paintContent(Table.java:3363)
	at com.vaadin.server.LegacyPaint.paint(LegacyPaint.java:65)
	at com.vaadin.server.communication.LegacyUidlWriter.write(LegacyUidlWriter.java:82)
	at com.vaadin.server.communication.UidlWriter.write(UidlWriter.java:143)
	at com.vaadin.server.communication.UIInitHandler.getInitialUidl(UIInitHandler.java:293)
	at com.vaadin.server.communication.UIInitHandler.synchronizedHandleRequest(UIInitHandler.java:80)
	at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
	at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1422)
	... 21 more

Caused by:

java.lang.NullPointerException
	at com.vaadin.ui.Table.findNumRowsToPaint(Table.java:3879)
	at com.vaadin.ui.Table.doPaintContent(Table.java:3377)
	at com.vaadin.ui.Table.paintContent(Table.java:3363)
	at com.vaadin.server.LegacyPaint.paint(LegacyPaint.java:65)
	at com.vaadin.server.communication.LegacyUidlWriter.write(LegacyUidlWriter.java:82)
	at com.vaadin.server.communication.UidlWriter.write(UidlWriter.java:143)
	at com.vaadin.server.communication.UIInitHandler.getInitialUidl(UIInitHandler.java:293)
	at com.vaadin.server.communication.UIInitHandler.synchronizedHandleRequest(UIInitHandler.java:80)
	at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
	at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1422)
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:384)
	at com.haulmont.studio.ui.app.aL.service(SourceFile:90)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
	at org.eclipse.jetty.server.Server.handle(Server.java:499)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:258)
	at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Thread.java:745)

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