ERROR:Microflow exception <substraction>

0
Hi all, I am Struggling Microflow exception. What I want to do is the subtraction variable A<$GetInventory/Labst> , and variable B<$GetInventory/Clabs> The formula is as below: $GetInventory/Labst-$GetInventory/Clabs There is no error on the error view window... The expception is as below. Anybody who know the cause of this error? Could you please tell me the solution? Thank you, *** com.mendix.core.CoreRuntimeException: An error occurred while executing the action 'MyFirstModule.Microflow'     at com.mendix.basis.objectmanagement.MendixObjectMemberImpl.getValue(MendixObjectMemberImpl.java:211) Caused by: com.mendix.modules.microflowengine.MicroflowException: Failed to evaluate expression, error occurred on line 1, character 1 $GetInventory/Labst-$GetInventory/Clabs ^     at MyFirstModule.Microflow (CreateOrChangeVariable : 'Create Decimal variable') Advanced stacktrace:     at com.mendix.languages.mxexpressions.MxExpression.evaluate(MxExpression.scala:21) Caused by: com.mendix.languages.expressions.ExpressionException: java.lang.IllegalArgumentException: Left and right hand side of binary expression should not be empty     at com.mendix.languages.expressions.Expr.evaluate(Expr.java:34) Caused by: java.lang.IllegalArgumentException: Left and right hand side of binary expression should not be empty     at com.mendix.languages.expressions.BinaryExpr.evaluateArithmeticOrComparisonExpression(BinaryExpr.java:165)     at com.mendix.languages.expressions.BinaryExpr.evaluateExpression(BinaryExpr.java:89)     at com.mendix.languages.expressions.Expr.evaluate(Expr.java:30)     at com.mendix.languages.mxexpressions.MxExpression.evaluate(MxExpression.scala:14)     at com.mendix.modules.microflowengine.actions.variable.CreateOrChangeVariableAction.execute(CreateOrChangeVariableAction.scala:32)     at com.mendix.modules.microflowengine.actions.variable.CreateOrChangeVariableAction.execute(CreateOrChangeVariableAction.scala:13)     at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.java:47)     at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.java:201)     at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.java:157)     at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:46)     at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:79)     at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:57)     at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:55)     at com.mendix.basis.actionmanagement.ActionManagerBase$1.execute(ActionManagerBase.java:150)     at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32)     at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:155)     at com.mendix.basis.component.InternalCoreBase.execute(InternalCoreBase.java:414)     at com.mendix.basis.objectmanagement.MendixObjectMemberImpl.getValue(MendixObjectMemberImpl.java:209)     at com.mendix.webui.jsonserialization.ValueConverter$$anon$1.apply(ValueConverter.scala:23)     at com.mendix.webui.jsonserialization.ValueConverter$.convertValue(ValueConverter.scala:105)     at com.mendix.webui.jsonserialization.ValueConverter$.convertOriginalMemberValue(ValueConverter.scala:21)     at com.mendix.webui.jsonserialization.MendixObjectConverter$.convertMemberValue(MendixObjectConverter.scala:75)     at com.mendix.webui.jsonserialization.MendixObjectConverter$.$anonfun$convert$6(MendixObjectConverter.scala:42)     at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:237)     at scala.collection.mutable.ResizableArray.foreach(ResizableArray.scala:62)     at scala.collection.mutable.ResizableArray.foreach$(ResizableArray.scala:55)     at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:49)     at scala.collection.TraversableLike.map(TraversableLike.scala:237)     at scala.collection.TraversableLike.map$(TraversableLike.scala:230)     at scala.collection.AbstractTraversable.map(Traversable.scala:108)     at com.mendix.webui.jsonserialization.MendixObjectConverter$.convert(MendixObjectConverter.scala:40)     at com.mendix.webui.actions.client.RetrieveByXPathAction.$anonfun$retrieveForDataGrid$1(RetrieveByXPathAction.scala:103)     at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:237)     at scala.collection.Iterator.foreach(Iterator.scala:941)     at scala.collection.Iterator.foreach$(Iterator.scala:941)     at scala.collection.AbstractIterator.foreach(Iterator.scala:1429)     at scala.collection.IterableLike.foreach(IterableLike.scala:74)     at scala.collection.IterableLike.foreach$(IterableLike.scala:73)     at scala.collection.AbstractIterable.foreach(Iterable.scala:56)     at scala.collection.TraversableLike.map(TraversableLike.scala:237)     at scala.collection.TraversableLike.map$(TraversableLike.scala:230)     at scala.collection.AbstractTraversable.map(Traversable.scala:108)     at com.mendix.webui.actions.client.RetrieveByXPathAction.convert(RetrieveByXPathAction.scala:190)     at com.mendix.webui.actions.client.RetrieveByXPathAction.retrieveForDataGrid(RetrieveByXPathAction.scala:97)     at com.mendix.webui.actions.client.RetrieveByXPathAction.apply(RetrieveByXPathAction.scala:62)     at com.mendix.webui.actions.client.RetrieveByXPathAction.apply(RetrieveByXPathAction.scala:31)     at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$4(RegularClientAction.scala:46)     at com.mendix.webui.requesthandling.helpers.StateHandling.withState(StateHandling.scala:33)     at com.mendix.webui.requesthandling.helpers.StateHandling.withState$(StateHandling.scala:21)     at com.mendix.webui.actions.client.RegularClientAction.withState(RegularClientAction.scala:21)     at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$3(RegularClientAction.scala:44)     at scala.util.Try$.apply(Try.scala:213)     at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2(RegularClientAction.scala:44)     at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2$adapted(RegularClientAction.scala:42)     at com.mendix.webui.requesthandling.helpers.ContextHandling.$anonfun$inContext$4(ContextHandling.scala:41)     at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)     at com.mendix.basis.actionmanagement.IMonitoredAction$$anon$1.execute(IMonitoredAction.scala:47)     at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32)     at com.mendix.basis.actionmanagement.IMonitoredAction.monitor(IMonitoredAction.scala:49)     at com.mendix.basis.actionmanagement.IMonitoredAction.monitor$(IMonitoredAction.scala:25)     at com.mendix.webui.requesthandling.helpers.ContextHandling$ClientMonitoredAction.monitor(ContextHandling.scala:49)     at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:41)     at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:27)     at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:21)     at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:24)     at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:19)     at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:21)     at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$1(RegularClientAction.scala:42)     at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)     at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest(ProfileHandling.scala:14)     at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest$(ProfileHandling.scala:10)     at com.mendix.webui.actions.client.RegularClientAction.profileRequest(RegularClientAction.scala:21)     at com.mendix.webui.actions.client.RegularClientAction.execute(RegularClientAction.scala:39)     at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:124)     at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:101)     at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:40)     at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:72)     at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:69)     at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32)     at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.java:75)     at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.java:909)     at com.mendix.m2ee.appcontainer.server.handler.RuntimeHandler.service(RuntimeHandler.java:42)     at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)     at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:867)     at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:542)     at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)     at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1588)     at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345)     at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)     at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)     at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1557)     at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)     at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247)     at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)     at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)     at org.eclipse.jetty.server.Server.handle(Server.java:502)     at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364)     at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)     at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)     at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)     at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)     at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)     at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)     at java.lang.Thread.run(Thread.java:748)  
asked
1 answers
2

My guess is, that one of your variables or one of your objects is empty at the moment the calculation is done. This would result in such an error.

You can use the debugger to verify and can add some extra checks for empty to prevent the error in the future.

answered