Exception creating new KSC report

Creating a new KSC report in 20.0 results in an exception:

org.springframework.web.util.NestedServletException at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857) at javax.servlet.http.HttpServlet.service(HttpServlet.java:575) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) at javax.servlet.http.HttpServlet.service(HttpServlet.java:668) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:838) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634) at org.opennms.container.web.felix.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:53) at org.opennms.container.web.felix.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:35) at org.opennms.container.web.felix.base.internal.dispatch.FilterPipeline.dispatch(FilterPipeline.java:50) at org.opennms.container.web.felix.base.internal.dispatch.Dispatcher.dispatch(Dispatcher.java:42) at org.opennms.container.web.bridge.internal.DispatcherFilter.doFilter(DispatcherFilter.java:72) at org.opennms.container.web.ProxyFilter.doFilter(ProxyFilter.java:56) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1621) at org.extremecomponents.table.filter.AbstractExportFilter.doFilter(AbstractExportFilter.java:49)