StudioPro throws an error System.NullReferenceException
4
I created a small app for the first time. The project check throws the error as shown below. It is propably not possible to diagnose the problem from the error message – but maybe somebody has a tip how I could find the error? System.AggregateException: One or more errors occurred. ---> System.NullReferenceException: Object reference not set to an instance of an object. at Mendix.Modeler.WebUI.Forms.Widgets.CustomWidgets.CustomWidget.Mendix.Modeler.WebUI.PluginWidgets.Export.IExportAsPluginWidget.get_ExportCondition() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\CustomWidgets\CustomWidget.cs:line 159 at Mendix.Modeler.WebUI.PluginWidgets.Export.PluginWidgetExtensions.<>c__DisplayClass2_0.<GetUnsupportedWidgetsInContent>b__0(Widget childOrSelf) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\PluginWidgets\Export\PluginWidgetExtensions.cs:line 50 at Mendix.Modeler.Storage.Operations.TypeWalk.ForEachObjectDo(IStorageObject root, Func`2 work, Boolean skipExcludedObjects) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\TypeWalk.cs:line 88 at Mendix.Modeler.Storage.Operations.TypeWalk.ForEachObjectDo(IStorageObject root, Func`2 work, Boolean skipExcludedObjects) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\TypeWalk.cs:line 93 at Mendix.Modeler.WebUI.PluginWidgets.Export.PluginWidgetExtensions.GetUnsupportedWidgetsInContent(IDocumentObject widget) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\PluginWidgets\Export\PluginWidgetExtensions.cs:line 46 at Mendix.Modeler.WebUI.Forms.Widgets.CustomWidgets.WidgetValue.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\CustomWidgets\WidgetValue.cs:line 327 at Mendix.Modeler.WebUI.Forms.Widgets.CustomWidgets.WidgetObject.<>c__DisplayClass5_0.<Check>b__0(WidgetProperty property) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\CustomWidgets\WidgetObject.cs:line 53 at Mendix.Common.Util.EnumerableUtil.ForEach[T](IEnumerable`1 source, Action`1 action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Common\Util\EnumerableUtil.cs:line 50 at Mendix.Modeler.WebUI.Forms.Widgets.CustomWidgets.CustomWidget.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\CustomWidgets\CustomWidget.cs:line 208 at Mendix.Modeler.WebUI.Forms.Widgets.LayoutGrids.LayoutGridColumn.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\LayoutGrids\LayoutGridColumn.cs:line 160 at Mendix.Modeler.WebUI.Forms.Widgets.LayoutGrids.LayoutGridRow.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\LayoutGrids\LayoutGridRow.cs:line 68 at Mendix.Modeler.WebUI.Forms.Widgets.LayoutGrids.LayoutGrid.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\LayoutGrids\LayoutGrid.cs:line 67 at Mendix.Modeler.WebUI.Forms.Widgets.FormCalls.LayoutCallArgument.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\FormCalls\LayoutCallArgument.cs:line 31 at Mendix.Modeler.WebUI.Forms.Documents.Layouts.LayoutCall.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Documents\Layouts\LayoutCall.cs:line 35 at Mendix.Modeler.WebUI.Forms.Documents.Pages.Page.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Documents\Pages\Page.cs:line 175 at Mendix.Common.Util.EnumerableUtil.ForEach[T](IEnumerable`1 source, Action`1 action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Common\Util\EnumerableUtil.cs:line 50 at Mendix.Modeler.Common.ResolveCache.TrackResolves(Action code) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Common\Problems\ResolveCache.cs:line 72 at Mendix.Modeler.Projects.Checks.DocumentCheck.CheckDocument(IDocument document, IUsages usages) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\DocumentCheck.cs:line 30 at Mendix.Modeler.Projects.Changes.ChangedDocumentsProcessor`1.<>c__DisplayClass5_0.<ProcessChangedDocuments>g__DoProcess|4(IDocument document) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Changes\ChangedDocumentsProcessor.cs:line 65 at Mendix.Common.Util.EnumerableUtil.ForEach[T](IEnumerable`1 source, Action`1 action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Common\Util\EnumerableUtil.cs:line 50 at Mendix.Modeler.Projects.Changes.ChangedDocumentsProcessor`1.ProcessChangedDocuments(IProject project, ProjectChanges projectChanges, Func`2 processDocument) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Changes\ChangedDocumentsProcessor.cs:line 59 at Mendix.Modeler.Projects.Checks.DocumentCheck.Check(IProject project, ProjectChanges changes, IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\DocumentCheck.cs:line 20 at Mendix.Modeler.Projects.Checks.ProjectChecker.<>c__DisplayClass4_0.<Check>b__0(ProjectChanges changes) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\ProjectChecker.cs:line 54 at Mendix.Modeler.Projects.Changes.ChangedDocumentTracker.TryProcessChangesSync(Action`1 changeProcessor) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Changes\ChangedDocumentTracker.cs:line 35 at Mendix.Modeler.Projects.Checks.ProjectChecker.Check(IProject project) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\ProjectChecker.cs:line 37 at Mendix.Modeler.Common.BackgroundCheckRunner.Check(IProject project) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core.View\Common\Problems\BackgroundCheckRunner.cs:line 103 at Mendix.Modeler.Common.BackgroundCheckRunner.<>c__DisplayClass5_0.<StartChecking>b__0() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core.View\Common\Problems\BackgroundCheckRunner.cs:line 46 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Mendix.Modeler.Common.BackgroundCheckRunner.<Start>d__4.MoveNext() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core.View\Common\Problems\BackgroundCheckRunner.cs:line 30 --- End of inner exception stack trace --- ---> (Inner Exception #0) System.NullReferenceException: Object reference not set to an instance of an object. at Mendix.Modeler.WebUI.Forms.Widgets.CustomWidgets.CustomWidget.Mendix.Modeler.WebUI.PluginWidgets.Export.IExportAsPluginWidget.get_ExportCondition() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\CustomWidgets\CustomWidget.cs:line 159 at Mendix.Modeler.WebUI.PluginWidgets.Export.PluginWidgetExtensions.<>c__DisplayClass2_0.<GetUnsupportedWidgetsInContent>b__0(Widget childOrSelf) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\PluginWidgets\Export\PluginWidgetExtensions.cs:line 50 at Mendix.Modeler.Storage.Operations.TypeWalk.ForEachObjectDo(IStorageObject root, Func`2 work, Boolean skipExcludedObjects) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\TypeWalk.cs:line 88 at Mendix.Modeler.Storage.Operations.TypeWalk.ForEachObjectDo(IStorageObject root, Func`2 work, Boolean skipExcludedObjects) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\TypeWalk.cs:line 93 at Mendix.Modeler.WebUI.PluginWidgets.Export.PluginWidgetExtensions.GetUnsupportedWidgetsInContent(IDocumentObject widget) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\PluginWidgets\Export\PluginWidgetExtensions.cs:line 46 at Mendix.Modeler.WebUI.Forms.Widgets.CustomWidgets.WidgetValue.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\CustomWidgets\WidgetValue.cs:line 327 at Mendix.Modeler.WebUI.Forms.Widgets.CustomWidgets.WidgetObject.<>c__DisplayClass5_0.<Check>b__0(WidgetProperty property) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\CustomWidgets\WidgetObject.cs:line 53 at Mendix.Common.Util.EnumerableUtil.ForEach[T](IEnumerable`1 source, Action`1 action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Common\Util\EnumerableUtil.cs:line 50 at Mendix.Modeler.WebUI.Forms.Widgets.CustomWidgets.CustomWidget.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\CustomWidgets\CustomWidget.cs:line 208 at Mendix.Modeler.WebUI.Forms.Widgets.LayoutGrids.LayoutGridColumn.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\LayoutGrids\LayoutGridColumn.cs:line 160 at Mendix.Modeler.WebUI.Forms.Widgets.LayoutGrids.LayoutGridRow.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\LayoutGrids\LayoutGridRow.cs:line 68 at Mendix.Modeler.WebUI.Forms.Widgets.LayoutGrids.LayoutGrid.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\LayoutGrids\LayoutGrid.cs:line 67 at Mendix.Modeler.WebUI.Forms.Widgets.FormCalls.LayoutCallArgument.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Widgets\FormCalls\LayoutCallArgument.cs:line 31 at Mendix.Modeler.WebUI.Forms.Documents.Layouts.LayoutCall.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Documents\Layouts\LayoutCall.cs:line 35 at Mendix.Modeler.WebUI.Forms.Documents.Pages.Page.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.WebUI\Forms\Documents\Pages\Page.cs:line 175 at Mendix.Common.Util.EnumerableUtil.ForEach[T](IEnumerable`1 source, Action`1 action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Common\Util\EnumerableUtil.cs:line 50 at Mendix.Modeler.Common.ResolveCache.TrackResolves(Action code) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Common\Problems\ResolveCache.cs:line 72 at Mendix.Modeler.Projects.Checks.DocumentCheck.CheckDocument(IDocument document, IUsages usages) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\DocumentCheck.cs:line 30 at Mendix.Modeler.Projects.Changes.ChangedDocumentsProcessor`1.<>c__DisplayClass5_0.<ProcessChangedDocuments>g__DoProcess|4(IDocument document) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Changes\ChangedDocumentsProcessor.cs:line 65 at Mendix.Common.Util.EnumerableUtil.ForEach[T](IEnumerable`1 source, Action`1 action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Common\Util\EnumerableUtil.cs:line 50 at Mendix.Modeler.Projects.Changes.ChangedDocumentsProcessor`1.ProcessChangedDocuments(IProject project, ProjectChanges projectChanges, Func`2 processDocument) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Changes\ChangedDocumentsProcessor.cs:line 59 at Mendix.Modeler.Projects.Checks.DocumentCheck.Check(IProject project, ProjectChanges changes, IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\DocumentCheck.cs:line 20 at Mendix.Modeler.Projects.Checks.ProjectChecker.<>c__DisplayClass4_0.<Check>b__0(ProjectChanges changes) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\ProjectChecker.cs:line 54 at Mendix.Modeler.Projects.Changes.ChangedDocumentTracker.TryProcessChangesSync(Action`1 changeProcessor) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Changes\ChangedDocumentTracker.cs:line 35 at Mendix.Modeler.Projects.Checks.ProjectChecker.Check(IProject project) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\ProjectChecker.cs:line 37 at Mendix.Modeler.Common.BackgroundCheckRunner.Check(IProject project) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core.View\Common\Problems\BackgroundCheckRunner.cs:line 103 at Mendix.Modeler.Common.BackgroundCheckRunner.<>c__DisplayClass5_0.<StartChecking>b__0() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core.View\Common\Problems\BackgroundCheckRunner.cs:line 46 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Mendix.Modeler.Common.BackgroundCheckRunner.<Start>d__4.MoveNext() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core.View\Common\Problems\BackgroundCheckRunner.cs:line 30<---