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

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java.lang.AbstractMethodError:
at com.google.gerrit.server.extensions.events.ReviewerAdded.fire(ReviewerAdded.java:59)
at com.google.gerrit.server.extensions.events.ReviewerAdded.fire(ReviewerAdded.java:72)
at com.google.gerrit.server.change.PostReviewers$Op.postUpdate(PostReviewers.java:360)
at com.google.gerrit.server.git.BatchUpdate.executePostOps(BatchUpdate.java:1050)
at com.google.gerrit.server.git.BatchUpdate.execute(BatchUpdate.java:450)
at com.google.gerrit.server.git.BatchUpdate.execute(BatchUpdate.java:647)
at com.google.gerrit.server.change.PostReviewers.apply(PostReviewers.java:156)
at com.google.gerrit.server.change.PostReviewers.apply(PostReviewers.java:77)
at com.google.gerrit.httpd.restapi.RestApiServlet.service(RestApiServlet.java:341)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:286)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:276)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:181)
at com.google.gerrit.httpd.GetUserFilter.doFilter(GetUserFilter.java:82)
at com.google.gwtexpui.server.CacheControlFilter.doFilter(CacheControlFilter.java:73)
at com.google.gerrit.httpd.RunAsFilter.doFilter(RunAsFilter.java:122)
at com.google.gerrit.httpd.RequestMetricsFilter.doFilter(RequestMetricsFilter.java:60)
at com.google.gerrit.httpd.AllRequestFilter$FilterProxy$1.doFilter(AllRequestFilter.java:136)
at com.google.gerrit.httpd.AllRequestFilter$FilterProxy.doFilter(AllRequestFilter.java:105)
at com.google.gerrit.httpd.RequestContextFilter.doFilter(RequestContextFilter.java:75)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
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:257)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at java.lang.Thread.run(Thread.java:745)

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