Hi All, I am using document template and tried adding dataview → table -→ dynamic label then the below error occurs. PFB screenshot for your reference. Also getting the below error whenever I do some actions inside the modulor. System.AggregateException: One or more errors occurred. (Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')) ---> System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index') at System.Collections.Generic.List`1.get_Item(Int32 index) at Mendix.Modeler.DocumentTemplates.Documents.Widgets.Tables.MxTable.CheckFullyMergedColumns(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.DocumentTemplates\Documents\Widgets\Tables\MxTable.cs:line 656 at Mendix.Modeler.DocumentTemplates.Documents.Widgets.Tables.MxTable.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.DocumentTemplates\Documents\Widgets\Tables\MxTable.cs:line 605 at Mendix.Modeler.DocumentTemplates.Documents.Widgets.DataViews.MxDataViewDropZone.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.DocumentTemplates\Documents\Widgets\DataViews\MxDataViewDropZone.cs:line 41 at Mendix.Modeler.DocumentTemplates.Documents.Widgets.DataViews.MxDataView.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.DocumentTemplates\Documents\Widgets\DataViews\MxDataView.cs:line 156 at Mendix.Modeler.DocumentTemplates.Documents.DocumentTemplate.Check(IProblems problems) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.DocumentTemplates\Documents\DocumentTemplate.cs:line 377 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 51 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 98 at Mendix.Modeler.Projects.Checks.DocumentCheck.CheckDocument(IDocument document, IUsages usages, CancellationToken cancellationToken) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\DocumentCheck.cs:line 0 at Mendix.Modeler.Projects.Changes.ChangedDocumentsProcessor`1.<>c__DisplayClass5_0.<ProcessChangedDocuments>g__DoProcess|5(IDocument document) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Changes\ChangedDocumentsProcessor.cs:line 70 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 51 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 64 at Mendix.Modeler.Projects.Checks.DocumentCheck.Check(IProject project, ProjectChanges changes, IProblems problems, CancellationToken cancellationToken) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\DocumentCheck.cs:line 21 at Mendix.Modeler.Projects.Checks.ProjectChecker.<>c__DisplayClass5_1.<Check>b__2(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 30 at Mendix.Modeler.Projects.Checks.ProjectChecker.<>c__DisplayClass5_0.<Check>b__1() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\ProjectChecker.cs:line 46 at Mendix.Modeler.Common.ResolveCache.WithCache[T](IProject project, Func`1 action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Common\Problems\ResolveCache.cs:line 61 at Mendix.Modeler.Projects.Checks.ProjectChecker.<>c__DisplayClass5_0.<Check>b__0() in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\ProjectChecker.cs:line 40 at Mendix.Modeler.ProtectedModules.ProtectedModulesUnlocker.ExecuteInContext[T](Boolean unlockImplementation, Func`1 code) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\ProtectedModules\ProtectedModulesUnlocker.cs:line 42 at Mendix.Modeler.ProtectedModules.ProtectedModulesUnlocker.Do[T](Boolean unlockImplementation, Func`1 action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\ProtectedModules\ProtectedModulesUnlocker.cs:line 29 at Mendix.Modeler.Projects.Checks.ProjectChecker.Check(IProject project, CancellationToken cancellationToken) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Projects\Checks\ProjectChecker.cs:line 39 at Mendix.Modeler.Common.NewBackgroundCheckRunner.Check(IProject project, CancellationToken cancellationToken) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core.View\Common\Problems\NewBackgroundCheckRunner.cs:line 43 at Mendix.Modeler.Common.NewBackgroundCheckRunner.Check(IProject project, CancellationToken cancellationToken) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core.View\Common\Problems\NewBackgroundCheckRunner.cs:line 52 --- End of inner exception stack trace --- has context menu Answers are really much appreciated!