"Error executing API request message, sending error response to caller!" appears in ThingWorx ApplicationLog.log multiple times

• When a Mashup is set up to use the GetProperties service with Automatically update values when able, messages are sometimes seen in ThingworxStorage\logs\ApplicationLog.log:

Error executing API request message, sending error response to caller!

• If Stack Trace is enabled, the following can be seen in ThingworxStorage\logs\ErrorLog.log: 

   Error executing API request message, sending error response to caller! com.thingworx.communications.server.security.NotAuthorizedException: Unable to lookup security context because ThingWorx Session ID [XXXX] is no longer valid!
      at com.thingworx.communications.platform.security.ThingworxSessionCache.lookupSecurityContext(ThingworxSessionCache.java:104)
      at com.thingworx.communications.platform.modules.DispatchingServerCommunicationModule.processAPIRequestMessage(DispatchingServerCommunicationModule.java:389)
      at com.thingworx.communications.platform.modules.DispatchingServerCommunicationModule.process(DispatchingServerCommunicationModule.java:296)
      at com.thingworx.communications.server.endpoints.DispatchingServerEndpoint.messageReceived(DispatchingServerEndpoint.java:103)
      at com.thingworx.communications.server.connection.jsr356.AbstractServerConnection.onThingworxMessage(AbstractServerConnection.java:416)
      at com.thingworx.communications.server.connection.jsr356.AbstractServerConnection.onMessage(AbstractServerConnection.java:342)
      at sun.reflect.GeneratedMethodAccessor61.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)
      at org.apache.tomcat.websocket.pojo.PojoMessageHandlerWholeBase.onMessage(PojoMessageHandlerWholeBase.java:80)
      at org.apache.tomcat.websocket.WsFrameBase.sendMessageBinary(WsFrameBase.java:582)
      at org.apache.tomcat.websocket.server.WsFrameServer.sendMessageBinary(WsFrameServer.java:131)
      at org.apache.tomcat.websocket.WsFrameBase.processDataBinary(WsFrameBase.java:541)
      at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:300)
      at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:133)
      at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:82)
      at org.apache.tomcat.websocket.server.WsFrameServer.doOnDataAvailable(WsFrameServer.java:171)
      at org.apache.tomcat.websocket.server.WsFrameServer.notifyDataAvailable(WsFrameServer.java:151)
      at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.upgradeDispatch(WsHttpUpgradeHandler.java:148)
      at org.apache.coyote.http11.upgrade.UpgradeProcessorInternal.dispatch(UpgradeProcessorInternal.java:54)
      at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:53)
      at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
      at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589)
      at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
      at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
      at java.lang.Thread.run(Thread.java:748)