# Trace: segment must have only one equipment reference **URL:** \ **Category:** Ignition\ **Created:** [December 12, 2014, 6:14pm UTC](https://forum.inductiveautomation.com/t/trace-segment-must-have-only-one-equipment-reference/9438 "2014-12-12T18:14:22Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![BugMagnet](https://avatars.discourse-cdn.com/v4/letter/b/b5e925/32.png) [@BugMagnet](https://forum.inductiveautomation.com/u/BugMagnet)\ **Post date:** [December 12, 2014, 6:14pm UTC](https://forum.inductiveautomation.com/t/trace-segment-must-have-only-one-equipment-reference/9438/1 "2014-12-12T18:14:22Z")
Testing the track and trace functions, I got: “Segment must have only one equipment reference before a segment can begin.” I understand that this is a known bug/‘feature’? Problem I am having is after I remove any additional “equipment references” in the segment definitions, the error still remains. I restarted the production module, the trace module and even the entire gateway yet the error remains, even with now only 1 equipment object being listed. Is there any workaround to get past that error? It seems it is triggered by stale data. Any way to clear that? Do I have to delete and rebuild the segment? Does this log help? INFO [PMISegmentSelector-AWT-EventQueue-2] createModel executed for equipmentPath BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line INFO [PMISegmentSelector-AWT-EventQueue-2] setResponseSegment() executed for equipmentPath BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line, response segment UUID null INFO [PMISegmentSelector-AWT-EventQueue-2] fireSelectorChangeEvent executed for equipmentPath BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line INFO [PMISegmentSelector-AWT-EventQueue-2] fireSelectorChangeEvent executed for equipmentPath BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line INFO [PMISegmentSelector-DesignerExecEngine-thread-1] notifySessionListener executed NotificationMessage message: mesoperstate, itemPath: [global]\BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line, data: fae1df9c-74a2-4c8f-b54c-3eb8c58175de INFO [PMISegmentSelector-DesignerExecEngine-thread-1] notifySessionListener executed for equipmentPath [global]\BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line INFO [PMISegmentSelector-AWT-EventQueue-2] createModel executed for equipmentPath BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line INFO [PMISegmentSelector-AWT-EventQueue-2] setResponseSegment() executed for equipmentPath BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line, response segment UUID null INFO [PMISegmentSelector-AWT-EventQueue-2] fireSelectorChangeEvent executed for equipmentPath BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line INFO [PMISegmentSelector-AWT-EventQueue-2] fireSelectorChangeEvent executed for equipmentPath BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line INFO [PMISegmentSelector-AWT-EventQueue-2] setResponseSegment() executed for equipmentPath BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line, response segment UUID 4b3d5b6d-dd39-46e1-896e-e14056ec085c INFO [PMISegmentSelector-AWT-EventQueue-2] fireSelectorChangeEvent executed for equipmentPath BugCorp\Test\_Site\_1\Cassette Build Area\Cell Feeder Line ERROR [ProductionRPCProxy-AWT-EventQueue-2] Failed: beginSegment com.inductiveautomation.ignition.client.gateway\_interface.GatewayException: Segment must only have one equipment reference before a segment can begin. at com.inductiveautomation.ignition.client.gateway\_interface.GatewayInterface.newGatewayException(GatewayInterface.java:321) at com.inductiveautomation.ignition.client.gateway\_interface.GatewayInterface.sendMessage(GatewayInterface.java:295) at com.inductiveautomation.ignition.client.gateway\_interface.GatewayInterface.sendMessage(GatewayInterface.java:252) at com.inductiveautomation.ignition.client.gateway\_interface.GatewayInterface.moduleInvoke(GatewayInterface.java:788) at com.sepasoft.production.rpc.ProductionRPCProxy.invoke(ProductionRPCProxy.java:79) at com.sepasoft.production.rpc.ProductionRPCProxy.beginSegment(ProductionRPCProxy.java:932) at com.sepasoft.trace.components.PMISegmentSelector.beginSegment(PMISegmentSelector.java:479) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.python.core.PyReflectedFunction. **call** (PyReflectedFunction.java:186) at org.python.core.PyReflectedFunction. **call** (PyReflectedFunction.java:204) at org.python.core.PyObject. **call** (PyObject.java:387) at org.python.core.PyObject. **call** (PyObject.java:391) at org.python.core.PyMethod. **call** (PyMethod.java:109) at org.python.pycode.\_pyx1.f$0(event:actionPerformed:1) at org.python.pycode.\_pyx1.call\_function(event:actionPerformed) at org.python.core.PyTableCode.call(PyTableCode.java:165) at org.python.core.PyCode.call(PyCode.java:18) at org.python.core.Py.runCode(Py.java:1275) at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:568) at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:561) at com.inductiveautomation.factorypmi.application.binding.action.ActionAdapter.runActions(ActionAdapter.java:170) at com.inductiveautomation.factorypmi.application.binding.action.ActionAdapter.invoke(ActionAdapter.java:265) at com.inductiveautomation.factorypmi.application.binding.action.RelayInvocationHandler.invoke(RelayInvocationHandler.java:55) at com.sun.proxy.$Proxy21.actionPerformed(Unknown Source) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$400(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) Caused by: java.lang.Exception: Segment must only have one equipment reference before a segment can begin. at com.sepasoft.production.mes.manager.MESOperationsManager.beginSegment(MESOperationsManager.java:683) at com.sepasoft.production.mes.manager.MESOperationsManager.beginSegment(MESOperationsManager.java:675) at com.sepasoft.production.gateway.ProductionGatewayHook$ProductionRPCHandler.beginSegment(ProductionGatewayHook.java:2362) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(null) at sun.reflect.DelegatingMethodAccessorImpl.invoke(null) at java.lang.reflect.Method.invoke(null) at com.inductiveautomation.ignition.gateway.servlets.gateway.functions.ModuleInvoke.invoke(ModuleInvoke.java:123) at com.inductiveautomation.ignition.gateway.servlets.Gateway.doPost(Gateway.java:346) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at com.inductiveautomation.ignition.gateway.bootstrap.MapServlet.service(MapServlet.java:85) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:696) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:526) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:568) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1110) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:453) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1044) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:459) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:280) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:229) at org.eclipse.jetty.io.AbstractConnection$1.run(AbstractConnection.java:505) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536) at java.lang.Thread.run(null)