Geoserver HTTP ERROR 500 on layer preview

I have followed the installation instructions on the official Geonode page to install it on ubuntu(18.04.4) and when I finish it I have published a Layer but when I click on Openlayers preview of the Geoserver layer,it viewed with this error:

---

HTTP ERROR 500

Problem accessing /geoserver/geonode/wms. Reason:

Server Error

Caused by:

java.lang.RuntimeException:
org.springframework.web.util.NestedServletException: Handler dispatch
failed; nested exception is java.lang.NoClassDefFoundError: Could not
initialize class sun.awt.X11GraphicsEnvironment at
org.geoserver.monitor.MonitorFilter.doFilter(MonitorFilter.java:193)
at
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
at
org.geoserver.wms.animate.AnimatorFilter.doFilter(AnimatorFilter.java:73)
at
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
at
org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:41)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at
org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:37)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at
…

---

I don’t know what is the problem, it must be from Geoserver because I already used the layer on another computer with Geoserver and it works perfectly.

The bottom of the error log is:

Caused by:

java.lang.NoClassDefFoundError: Could not initialize class
sun.awt.X11GraphicsEnvironment at java.lang.Class.forName0(Native
Method) at java.lang.Class.forName(Class.java:264) at
java.awt.GraphicsEnvironment.createGE(GraphicsEnvironment.java:103)
at
java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:82)
at
java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1181)
at java.awt.image.BufferedImage.getGraphics(BufferedImage.java:1170)
at
org.geoserver.wms.WMSServiceExceptionHandler.handleImageException(WMSServiceExceptionHandler.java:214)
at
org.geoserver.wms.WMSServiceExceptionHandler.handleServiceException(WMSServiceExceptionHandler.java:147)
at
org.geoserver.ows.Dispatcher.handleServiceException(Dispatcher.java:1799)
at org.geoserver.ows.Dispatcher.exception(Dispatcher.java:1746) at
org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:275)
at
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:177)
at
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:52)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:998)
at
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:890)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) at
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:875)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:841)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at
org.geoserver.filters.ThreadLocalsCleanupFilter.doFilter(ThreadLocalsCleanupFilter.java:26)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:69)
at
org.geoserver.flow.controller.IpBlacklistFilter.doFilter(IpBlacklistFilter.java:89)
at
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
at
org.geoserver.monitor.MonitorFilter.doFilter(MonitorFilter.java:140)
at
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
at
org.geoserver.wms.animate.AnimatorFilter.doFilter(AnimatorFilter.java:73)
at
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
at
org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:41)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at
org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:37)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
at
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
at
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
at
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
at
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
at
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
at
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
at
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
at
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at
org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:51)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at
org.geoserver.security.oauth2.GeoServerOAuthAuthenticationFilter.doFilter(GeoServerOAuthAuthenticationFilter.java:174)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
at
org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:158)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
at
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
at
org.geoserver.security.filter.GeoServerBasicAuthenticationFilter.doFilter(GeoServerBasicAuthenticationFilter.java:81)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
at
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
at
org.geoserver.security.filter.GeoServerSecurityContextPersistenceFilter$1.doFilter(GeoServerSecurityContextPersistenceFilter.java:52)
at
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
at
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
at
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
at
org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:142)
at
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357)
at
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at
org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:101)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:47) at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at
org.geoserver.filters.SessionDebugFilter.doFilter(SessionDebugFilter.java:46)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at
org.geoserver.filters.FlushSafeFilter.doFilter(FlushSafeFilter.java:42)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
at
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1629)
at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
at
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:219)
at
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:561) at
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:334) at
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
at
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:104)
at
org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:247)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:140)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
at
org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:243)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:679)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:597)
at java.lang.Thread.run(Thread.java:748)

And My console have these error: