Failure to open an information link, with "Multiple values not allowed without aggregation" stated in the details of the error message, typically indicates that the information link has a conditioning pivot whose "Other columns" field includes at least one column with an aggregation method of "None", and the pivot's "slicing" of that column results in multiple distinct values for each of its cells, so that aggregation is necessary. In some situations, the "None" aggregation method will be changed behind the scenes to an aggregation method of "First", and this will show up in the "Edit > Column Properties" dialog as an entry of "First" for that column's "Pivot.AggregationMethod" property. In other situations, the "None" aggregation is retained, and the error message and exception reported are returned.

Example error message:
----------------------------------------- 
Error message: Could not open information link.

ImportException at Spotfire.Dxp.Data:
Failed to execute data source query. (HRESULT: 80131500)


Stack Trace:
   at Spotfire.Dxp.Data.DataSourceConnection.ExecuteQuery2()
   at Spotfire.Dxp.Data.DataFlow.Execute()
   at Spotfire.Dxp.Data.DataFlow.DataFlowConnection.ExecuteQueryCore2()
   at Spotfire.Dxp.Data.DataSourceConnection.ExecuteQuery2()
   at Spotfire.Dxp.Data.Producers.SourceColumnProducer.<>c__DisplayClass15.<GetColumnsAndProperties>b__12()
   at Spotfire.Dxp.Framework.ApplicationModel.Progress.ExecuteSubtask(String title, ProgressOperation operation)
   at Spotfire.Dxp.Data.Producers.SourceColumnProducer.GetColumnsAndProperties(DataSourceConnection connection)
   at Spotfire.Dxp.Data.Persistence.DataItem.PerformUpdate(SourceColumnProducer producer, DataSourceConnection connection)
   at Spotfire.Dxp.Data.Persistence.DataItem.Update(SourceColumnProducer producer, DataSourceConnection connection)
   at Spotfire.Dxp.Data.Persistence.DataPool.<LoadData>d__2.MoveNext()
   at Spotfire.Dxp.Data.Producers.SourceColumnProducer.ConfigureAndLoadData()
   at Spotfire.Dxp.Framework.DocumentModel.Node.ConfigureSubTree()
   at Spotfire.Dxp.Framework.DocumentModel.Node.<ConfigureSubTree>b__13(Node node)
   at Spotfire.Dxp.Framework.DocumentModel.Node.ConfigureSubTree()
   at Spotfire.Dxp.Framework.DocumentModel.Node.<ConfigureSubTree>b__13(Node node)
   at Spotfire.Dxp.Framework.DocumentModel.Node.ConfigureSubTree()
   at Spotfire.Dxp.Framework.DocumentModel.Node.<ConfigureSubTree>b__13(Node node)
   at Spotfire.Dxp.Framework.DocumentModel.State.NodeState.ForEachChild(IDocumentNodeChild[] children, Action`1 action)
   at Spotfire.Dxp.Framework.DocumentModel.Node.ConfigureSubTree()
   at Spotfire.Dxp.Framework.ApplicationModel.Progress.ExecuteSubtask(String title, IndeterminateProgressFormatter progressFormatter, ProgressSpeedFormatter speedFormatter, ProgressOperation operation)
   at Spotfire.Dxp.Framework.DocumentModel.DocumentNode.ConfigureAndAttachFromNew()
   at Spotfire.Dxp.Framework.DocumentModel.DocumentNode.AttachSubTreeWhileExecuting(UndoableNode newOwner)
   at Spotfire.Dxp.Framework.DocumentModel.DocumentNode.AttachToUndoableNode(UndoableNode newOwner)
   at Spotfire.Dxp.Framework.DocumentModel.UndoableKeyedCollection`2.<>c__DisplayClass6.<Insert>b__5()
   at Spotfire.Dxp.Framework.DocumentModel.Node.Spotfire.Dxp.Framework.DocumentModel.INode.InternalTransaction(Executor executor)
   at Spotfire.Dxp.Framework.DocumentModel.UndoableKeyedCollection`2.Insert(Int32 index, TNode item)
   at Spotfire.Dxp.Data.DataTableCollection.<>c__DisplayClass20.<Add>b__1f()
   at Spotfire.Dxp.Framework.DocumentModel.Node.Spotfire.Dxp.Framework.DocumentModel.INode.InternalTransaction(Executor executor)
   at Spotfire.Dxp.Data.DataTableCollection.Add(String dataTableName, DataSource dataSource, Boolean autoCreateFilters, Boolean includeInAxisControls)
   at Spotfire.Dxp.Application.PartiallyOpenedDataSource.<LoadData>d__0.MoveNext()
   at Spotfire.Dxp.Application.AnalysisApplication.<OpenPartiallyOpenedDocument>d__34.MoveNext()
   at Spotfire.Dxp.Application.AnalysisApplication.<OpenDataSource>d__1b.MoveNext()
   at Spotfire.Dxp.Application.AnalysisApplication.ConsumeDataLoadPromptRequests(IEnumerable`1 prompts)
   at Spotfire.Dxp.Application.AnalysisApplication.Open(DataSource source, DocumentOpenSettings settings)
   at Spotfire.Dxp.Forms.Data.Import.DataSourceFactoryService.OpenDataSourceWithoutPrompting(DataSource dataSource, DocumentOpenSettings documentOpenSettings, IServiceProvider serviceProvider)
   at Spotfire.Dxp.Forms.Data.Import.DataSourceFactoryService.OpenDataSource(InformationLinkDataSource dataSource, DocumentOpenSettings documentOpenSettings, IServiceProvider serviceProvider)
   at Spotfire.Dxp.Forms.Data.Import.DataSourceFactoryService.OpenDataSource(DataSource dataSource, IServiceProvider serviceProvider)
   at Spotfire.Dxp.Forms.Application.FormsProgressService.ProgressThread.DoOperationLoop()

InformationModelException at Spotfire.Dxp.Data:

An Internal Error has occurred. com.spotfire.ws.dat.OperatorException: Multiple values not allowed without aggregation (HRESULT: 80131500)

Stack Trace:
   at Spotfire.Dxp.Data.InformationModel.InternalInformationModelManager.DataStream.GetNextBlock()
   at Spotfire.Dxp.Data.InformationModel.InternalInformationModelManager.DataStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at Spotfire.Dxp.Internal.Utilities.SeekableStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at System.IO.BinaryReader.FillBuffer(Int32 numBytes)
   at System.IO.BinaryReader.ReadUInt16()
   at Spotfire.Dxp.Data.Formats.Sbdf.SbdfSectionHeader.ReadSectionType(BinaryReader reader, SbdfSectionTypeId expectedType)
   at Spotfire.Dxp.Data.Import.SbdfDataRowReader.DelayedInit()
   at Spotfire.Dxp.Data.Import.InformationLinkDataSourceConnection.ExecuteQueryCore2()
   at Spotfire.Dxp.Data.DataSourceConnection.ExecuteQuery2()

InformationModelServiceException at Spotfire.Dxp.Services:

An Internal Error has occurred. com.spotfire.ws.dat.OperatorException: Multiple values not allowed without aggregation (HRESULT: 80131509)

Stack Trace:
   at Spotfire.Dxp.Services.WebServiceBase`1.InvokeService[T](ServiceMethod`1 serviceMethod, ExceptionFactoryMethod exceptionFactoryMethod)
   at Spotfire.Dxp.Data.InformationModel.InternalInformationModelManager.DataStream.GetNextBlock()