The jenkins log is full of warnings shown below:

WARNING: failed to uncoerce hudson.plugins.robot.RobotPublisher@1f5a660a
java.lang.UnsupportedOperationException: no public field ‘enableCache’ (or getter method) found in class hudson.plugins.robot.RobotPublisher
at org.jenkinsci.plugins.structs.describable.DescribableParameter.getValue(DescribableParameter.java:161)
at org.jenkinsci.plugins.structs.describable.DescribableParameter.inspect(DescribableParameter.java:142)
at org.jenkinsci.plugins.structs.describable.DescribableModel.uninstantiate2(DescribableModel.java:533)
at org.jenkinsci.plugins.structs.describable.DescribableModel.uninstantiate2_(DescribableModel.java:652)
at org.jenkinsci.plugins.structs.describable.DescribableParameter.uncoerce(DescribableParameter.java:196)
at org.jenkinsci.plugins.structs.describable.DescribableParameter.inspect(DescribableParameter.java:142)
at org.jenkinsci.plugins.structs.describable.DescribableModel.uninstantiate2(DescribableModel.java:533)
at org.jenkinsci.plugins.workflow.actions.ArgumentsAction.resolve(ArgumentsAction.java:304)
at org.jenkinsci.plugins.workflow.actions.ArgumentsAction.getResolvedArguments(ArgumentsAction.java:291)
at org.jenkinsci.plugins.workflow.cps.nodes.StepAtomNode.getDelegateType(StepAtomNode.java:134)
at org.jenkinsci.plugins.workflow.cps.nodes.StepAtomNode.effectiveDisplayName(StepAtomNode.java:90)
at org.jenkinsci.plugins.workflow.cps.nodes.StepAtomNode.getTypeDisplayName(StepAtomNode.java:102)
at org.jenkinsci.plugins.workflow.graph.FlowNode.getDisplayName(FlowNode.java:189)
at com.cloudbees.workflow.rest.external.FlowNodeExt.addBasicNodeData(FlowNodeExt.java:194)
at com.cloudbees.workflow.rest.external.AtomFlowNodeExt.create(AtomFlowNodeExt.java:70)
at com.cloudbees.workflow.rest.external.ChunkVisitor.makeAtomNode(ChunkVisitor.java:68)
at com.cloudbees.workflow.rest.external.ChunkVisitor.atomNode(ChunkVisitor.java:154)
at org.jenkinsci.plugins.workflow.graphanalysis.ForkScanner.fireVisitChunkCallbacks(ForkScanner.java:751)
at org.jenkinsci.plugins.workflow.graphanalysis.ForkScanner.visitSimpleChunks(ForkScanner.java:769)
at org.jenkinsci.plugins.workflow.graphanalysis.ForkScanner.visitSimpleChunks(ForkScanner.java:633)
at com.cloudbees.workflow.rest.external.RunExt.createNew(RunExt.java:321)
at com.cloudbees.workflow.rest.external.RunExt.create(RunExt.java:309)
at com.cloudbees.workflow.rest.external.JobExt.create(JobExt.java:131)
at com.cloudbees.workflow.rest.endpoints.JobAPI.doRuns(JobAPI.java:69)
at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:343)
at com.cloudbees.workflow.util.ServeJson$Processor.invoke(ServeJson.java:30)
at org.kohsuke.stapler.PreInvokeInterceptedFunction.invoke(PreInvokeInterceptedFunction.java:26)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:184)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:117)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:129)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
at org.kohsuke.stapler.MetaClass$10.dispatch(MetaClass.java:374)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:135)
at com.smartcodeltd.jenkinsci.plugin.assetbundler.filters.LessCSS.doFilter(LessCSS.java:47)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
at hudson.plugins.audit_trail.AuditTrailFilter.doFilter(AuditTrailFilter.java:95)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:232)
at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:209)
at net.bull.javamelody.PluginMonitoringFilter.doFilter(PluginMonitoringFilter.java:88)
at org.jvnet.hudson.plugins.monitoring.HudsonMonitoringFilter.doFilter(HudsonMonitoringFilter.java:113)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
: