Microflow problem in calculation sheet

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Hi there. I have a persistent problem that i just cant figure out how to solve. I have a entity with 3 integers. I created a microflow to multiply 2 integers and show the result in integer 3. I have created the overview and New_edit page automatically via the entity. Whenever i try to open the New_Edit page to give input i get this error "An error occurred, please contact your system administrator." Whever i change the Calculated radiobutton in the associated entity to "Stored" whereby the Microflow is not called the New_edit Page opens but no calculation is performed. There is no error in the MF. I retrieve the list from the database as first action and select the members , then i create a Integer variable and then i change the variable and add the calculation in there. Then i set the return value. I dont see anything wrong here. I also receive this error. Any Idea whats wrong here? Mendix version 10.8  
asked
4 answers
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Mostly there is a second error just below this one with more information.

answered
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Hi Edwin,

 

This is the other errormessage:

 

An error has occurred while handling the request. [User 'Anonymous_80be1f74-0be9-4168-966c-9e3434952390' with session id '6a55118f-XXXX-XXXX-XXXX-XXXXXXXX67fb' and roles 'User']

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com.mendix.webui.WebUIException: Exception while executing runtime operation    at com.mendix.webui.actions.client.RuntimeOperationAction.apply(RuntimeOperationAction.scala:72)

Caused by: com.mendix.core.CoreRuntimeException: An error occurred while executing the action 'MyFirstModule.CalculateTotalWattPeakMicroFlow'    at com.mendix.basis.objectmanagement.MendixObjectMemberImpl.getValue(MendixObjectMemberImpl.java:228)

Caused by: com.mendix.modules.microflowengine.MicroflowException: Failed to evaluate expression, error occurred on line 1, character 1$ProjectModules/NumberOfModules * $ProjectModules/WattagePerModule^    at MyFirstModule.CalculateTotalWattPeakMicroFlow (CreateOrChangeVariable : 'Change variable TotalWattPeak')

Advanced stacktrace:    at com.mendix.languages.mxexpressions.MxExpressionImpl.evaluate(MxExpressionImpl.scala:32)

Caused by: com.mendix.languages.expressions.ExpressionException: Left and right hand side of binary expression should not be empty    at com.mendix.languages.expressions.Expr.evaluate(Expr.scala:16)

Caused by: java.lang.IllegalArgumentException: Left and right hand side of binary expression should not be empty    at com.mendix.languages.expressions.BinaryExpr$$anonfun$error$1.applyOrElse(BinaryExpr.scala:50)    at com.mendix.languages.expressions.BinaryExpr$$anonfun$error$1.applyOrElse(BinaryExpr.scala:48)    at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:35)    at com.mendix.languages.expressions.BinaryExpr$$anonfun$multiply$1.applyOrElse(BinaryExpr.scala:104)    at com.mendix.languages.expressions.BinaryExpr$$anonfun$multiply$1.applyOrElse(BinaryExpr.scala:104)    at com.mendix.languages.expressions.BinaryExpr.evaluateExpression(BinaryExpr.scala:32)    at com.mendix.languages.expressions.Expr.evaluate(Expr.scala:13)    at com.mendix.languages.mxexpressions.MxExpressionImpl.evaluate(MxExpressionImpl.scala:25)    at com.mendix.languages.mxexpressions.MxExpressionImpl.evaluate(MxExpressionImpl.scala:15)    at com.mendix.modules.microflowengine.actions.variable.CreateOrChangeVariableAction.execute(CreateOrChangeVariableAction.scala:20)    at com.mendix.modules.microflowengine.actions.variable.CreateOrChangeVariableAction.execute(CreateOrChangeVariableAction.scala:10)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.$anonfun$execute$1(MicroflowObject.scala:31)    at scala.Option.flatMap(Option.scala:283)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.scala:28)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.scala:176)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.scala:116)    at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:58)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:48)    at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:57)    at com.mendix.basis.actionmanagement.ActionManager.$anonfun$executeSync$2(ActionManager.scala:104)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:103)    at com.mendix.basis.actionmanagement.MicroflowCallBuilderImpl.execute(MicroflowCallBuilderImpl.scala:64)    at com.mendix.basis.objectmanagement.MendixObjectMemberImpl.getValue(MendixObjectMemberImpl.java:226)    at com.mendix.basis.objectmanagement.member.MendixIntegerImpl.getValue(MendixIntegerImpl.scala:20)    at com.mendix.basis.objectmanagement.member.MendixIntegerImpl.getValue(MendixIntegerImpl.scala:11)    at com.mendix.webui.jsonserialization.ValueConverter$$anon$1.apply(ValueConverter.scala:31)    at com.mendix.webui.jsonserialization.ValueConverter$.convertValue(ValueConverter.scala:138)    at com.mendix.webui.jsonserialization.ValueConverter$.convertOriginalMemberValue(ValueConverter.scala:29)    at com.mendix.webui.jsonserialization.MendixObjectConverter$.convertMemberValue(MendixObjectConverter.scala:80)    at com.mendix.webui.jsonserialization.MendixObjectConverter$.$anonfun$convert$1(MendixObjectConverter.scala:30)    at scala.collection.MapView$MapValues.$anonfun$iterator$1(MapView.scala:119)    at scala.collection.Iterator$$anon$9.next(Iterator.scala:584)    at scala.collection.mutable.Growable.addAll(Growable.scala:62)    at scala.collection.mutable.Growable.addAll$(Growable.scala:57)    at scala.collection.immutable.MapBuilderImpl.addAll(Map.scala:690)    at scala.collection.immutable.Map$.from(Map.scala:641)    at scala.collection.IterableOnceOps.toMap(IterableOnce.scala:1320)    at scala.collection.IterableOnceOps.toMap$(IterableOnce.scala:1319)    at scala.collection.AbstractIterable.toMap(Iterable.scala:933)    at com.mendix.webui.jsonserialization.MendixObjectConverter$.convert(MendixObjectConverter.scala:30)    at com.mendix.webui.jsonserialization.MendixObjectConverter$.convert(MendixObjectConverter.scala:23)    at com.mendix.webui.jsonserialization.OutgoingState$.$anonfun$getResponse$1(OutgoingState.scala:37)    at scala.collection.immutable.List.map(List.scala:246)    at scala.collection.immutable.List.map(List.scala:79)    at com.mendix.webui.jsonserialization.OutgoingState$.getResponse(OutgoingState.scala:37)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:62)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:46)    at com.mendix.webui.actions.client.RuntimeOperationAction.executeObjectAction(RuntimeOperationAction.scala:111)    at com.mendix.webui.actions.client.RuntimeOperationAction.apply(RuntimeOperationAction.scala:67)    at com.mendix.webui.actions.client.RuntimeOperationAction.apply(RuntimeOperationAction.scala:25)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$.$anonfun$liftEither$1(RegularClientAction.scala:30)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$3(RegularClientAction.scala:120)    at scala.util.Try$.apply(Try.scala:210)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2(RegularClientAction.scala:120)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2$adapted(RegularClientAction.scala:118)    at com.mendix.webui.requesthandling.helpers.ContextHandling.$anonfun$inContext$7(ContextHandling.scala:59)    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)    at com.mendix.basis.actionmanagement.ActionMonitoring$.$anonfun$monitor$1(ActionMonitoring.scala:52)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.basis.actionmanagement.ActionMonitoring$.monitor(ActionMonitoring.scala:52)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:59)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:33)    at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:94)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:30)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:22)    at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:94)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$1(RegularClientAction.scala:118)    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)    at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest(ProfileHandling.scala:14)    at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest$(ProfileHandling.scala:10)    at com.mendix.webui.actions.client.RegularClientAction.profileRequest(RegularClientAction.scala:94)    at com.mendix.webui.actions.client.RegularClientAction.execute(RegularClientAction.scala:115)    at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:95)    at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:68)    at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:37)    at com.mendix.external.connector.MxRuntimeConnector.$anonfun$processRequest$1(MxRuntimeConnector.scala:54)    at com.mendix.external.connector.MxRuntimeConnector.$anonfun$processRequest$1$adapted(MxRuntimeConnector.scala:54)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.scala:54)    at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.scala:513)    at com.mendix.m2ee.appcontainer.server.handler.RuntimeServlet.service(RuntimeServlet.scala:40)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)    at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)    at org.eclipse.jetty.websocket.servlet.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:170)    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1580)    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1384)    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1553)    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1306)    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)    at org.eclipse.jetty.server.Server.handle(Server.java:563)    at org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)    at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:287)    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)    at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)    at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)    at java.base/java.lang.Thread.run(Thread.java:829)

answered
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CreateOrChangeVariable : 'Change variable TotalWattPeak'

$ProjectModules/NumberOfModules * $ProjectModules/WattagePerModule^

Left and right hand side of binary expression should not be empty

 

of NumberOfModules is empty or WattagePerModule is empty

answered
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What does that mean? As im quit new it might seem a silly question but im trying to fix this for the last 4 hours. Many thanks in advance Edwin.

answered