workflow view not working

[Jira Support]

Hi,  i am getting the below error while access the /secure/admin/workflows/ListWorkflows.jspa. 

And it shows the below error.

To delete a workflow, you must first unassign it from all workflow schemes and draft workflow schemes.

and the below is the log found in catalina.out.

2019-11-19 05:34:50,020 http-nio-8080-exec-3 ERROR raja 334x6007x1 pgraml 111.93.187.58,0:0:0:0:0:0:0:1 /secure/admin/workflows/ListWorkflows.jspa [webwork.util.ValueStack] query="activeWorkflows/empty" {[id="activeWorkflows" type="8" values=""]} {[id="empty" type="8" values=""]}
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:70)
at webwork.util.InjectionUtils.invoke(InjectionUtils.java:56)
at webwork.util.ValueStack.findValue(ValueStack.java:417)
at webwork.util.SimpleTest.test(SimpleTest.java:408)
at webwork.util.ValueStack.test(ValueStack.java:157)
at webwork.view.taglib.IfTag.doStartTag(IfTag.java:40)
at jsp.secure.admin.views.workflow.listworkflows_jsp._jspx_meth_ww_005fif_005f3(listworkflows_jsp.java:1412)
at jsp.secure.admin.views.workflow.listworkflows_jsp._jspService(listworkflows_jsp.java:294)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
... 48 filtered
at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
... 45 filtered
at com.atlassian.jira.security.JiraSecurityFilter.lambda$doFilter$0(JiraSecurityFilter.java:66)
... 1 filtered
at com.atlassian.jira.security.JiraSecurityFilter.doFilter(JiraSecurityFilter.java:64)
... 20 filtered
at com.atlassian.jira.servermetrics.CorrelationIdPopulatorFilter.doFilter(CorrelationIdPopulatorFilter.java:30)
... 12 filtered
at com.atlassian.jira.servermetrics.MetricsCollectorFilter.doFilter(MetricsCollectorFilter.java:25)
... 11 filtered
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
... 48 filtered
at com.atlassian.greenhopper.jira.filters.ClassicBoardRouter.doFilter(ClassicBoardRouter.java:62)
... 12 filtered
at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
... 20 filtered
at com.intenso.jira.plugins.contentinjection.filter.ContentInjectionFilter.doFilter(ContentInjectionFilter.java:41)
... 3 filtered
at com.intenso.jira.contentinjection.filter.ContentInjectionFilter.doFilter(ContentInjectionFilter.java:71)
... 45 filtered
at com.atlassian.jira.security.JiraSecurityFilter.lambda$doFilter$0(JiraSecurityFilter.java:66)
... 1 filtered
at com.atlassian.jira.security.JiraSecurityFilter.doFilter(JiraSecurityFilter.java:64)
... 39 filtered
at com.atlassian.jira.servermetrics.CorrelationIdPopulatorFilter.doFilter(CorrelationIdPopulatorFilter.java:30)
... 10 filtered
at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
... 4 filtered
at com.atlassian.web.servlet.plugin.LocationCleanerFilter.doFilter(LocationCleanerFilter.java:36)
... 26 filtered
at com.atlassian.jira.servermetrics.MetricsCollectorFilter.doFilter(MetricsCollectorFilter.java:25)
... 23 filtered
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.atlassian.cache.CacheException: java.lang.RuntimeException: com.opensymphony.workflow.FactoryException: Error converting XML to workflow descriptor.: root cause: Duplicate occurance of action ID 51 found in step 3
at com.atlassian.cache.memory.DelegatingCache.get(DelegatingCache.java:211)
at com.atlassian.cache.memory.DelegatingCache.get(DelegatingCache.java:162)
at com.atlassian.jira.workflow.CachingWorkflowDescriptorStore.getWorkflow(CachingWorkflowDescriptorStore.java:64)
at com.atlassian.jira.workflow.JiraWorkflowFactory.getWorkflow(JiraWorkflowFactory.java:33)
at com.opensymphony.workflow.config.DefaultConfiguration.getWorkflow(DefaultConfiguration.java:89)
at com.atlassian.jira.workflow.OSWorkflowManager.getWorkflows(OSWorkflowManager.java:121)
at com.atlassian.jira.web.action.admin.workflow.ListWorkflows.getWorkflows(ListWorkflows.java:117)
at com.atlassian.jira.web.action.admin.workflow.ListWorkflows.getActiveWorkflows(ListWorkflows.java:123)
... 402 more
Caused by: java.lang.RuntimeException: com.opensymphony.workflow.FactoryException: Error converting XML to workflow descriptor.: root cause: Duplicate occurance of action ID 51 found in step 3
at com.atlassian.jira.workflow.CachingWorkflowDescriptorStore.loadWorkflowDescriptor(CachingWorkflowDescriptorStore.java:110)
at com.atlassian.cache.memory.MemoryCacheManager$3$1.load(MemoryCacheManager.java:207)
at com.atlassian.cache.memory.DelegatingCache.lambda$get$0(DelegatingCache.java:162)
at com.atlassian.cache.memory.DelegatingCache.lambda$get$1(DelegatingCache.java:190)
at com.google.common.cache.LocalCache$LocalManualCache$1.load(LocalCache.java:4742)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2319)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2282)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2197)
at com.google.common.cache.LocalCache.get(LocalCache.java:3937)
at com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4739)
at com.atlassian.cache.memory.DelegatingCache.get(DelegatingCache.java:177)
... 410 more
Caused by: com.opensymphony.workflow.FactoryException: Error converting XML to workflow descriptor.: root cause: Duplicate occurance of action ID 51 found in step 3
at com.atlassian.jira.workflow.WorkflowUtil.convertXMLtoWorkflowDescriptor(WorkflowUtil.java:200)
at com.atlassian.jira.workflow.OfBizWorkflowDescriptorStore.convertGVToDescriptor(OfBizWorkflowDescriptorStore.java:135)
at com.atlassian.jira.workflow.OfBizWorkflowDescriptorStore.getWorkflow(OfBizWorkflowDescriptorStore.java:43)
at com.atlassian.jira.workflow.CachingWorkflowDescriptorStore.loadWorkflowDescriptor(CachingWorkflowDescriptorStore.java:108)
... 421 more
at com.opensymphony.workflow.loader.WorkflowDescriptor.validate(WorkflowDescriptor.java:373)
at com.opensymphony.workflow.loader.WorkflowLoader.load(WorkflowLoader.java:82)
at com.opensymphony.workflow.loader.WorkflowLoader.load(WorkflowLoader.java:47)
at com.atlassian.jira.workflow.WorkflowUtil.convertXMLtoWorkflowDescriptor(WorkflowUtil.java:198)
... 424 more

Please guide me