Non-negative number required error while appending tables

I am having this same problem with my report. All I'm trying to do is load data into my report from SQL Server using a query. The query runs just fine in Management Studio, but Power BI gives me the error message.

Can we please get a fix for the mashup engine?

Here is my error message:

Unexpected error: Non-negative number required.
    Parameter name: value
    Details:
        Microsoft.Mashup.Evaluator.Interface.ErrorException: Non-negative number required.
    Parameter name: value ---> System.ArgumentOutOfRangeException: Non-negative number required.
    Parameter name: value ---> System.ArgumentOutOfRangeException: Non-negative number required.
    Parameter name: value
       at System.IO.FileStream.set_Position(Int64 value)
       at Microsoft.Mashup.EngineHost.Services.StreamSharer.MoveTo(SubStream subStream, Int64 position)
       at Microsoft.Mashup.EngineHost.Services.StreamSharer.ReadAt(SubStream subStream, Int64 position, Byte[] buffer, Int32 offset, Int32 count)
       at Microsoft.Mashup.EngineHost.Services.StreamSharer.SubStream.Read(Byte[] buffer, Int32 offset, Int32 count)
       at System.IO.BufferedStream.Read(Byte[] array, Int32 offset, Int32 count)
       at Microsoft.Mashup.EngineHost.Services.TransformingPagedStream.ReadPage(Int32 page, Byte[] buffer)
       at Microsoft.Mashup.EngineHost.Services.PagedStream.SeekToPage(Int32 page)
       at Microsoft.Mashup.EngineHost.Services.PagedStream.Write(Byte[] array, Int32 offset, Int32 count)
       at Microsoft.Mashup.EngineHost.Services.WriteBehindPersistentCache.AsyncCommitStorage(String key, TemporaryStorage storage)
       at Microsoft.Mashup.EngineHost.Services.WriteBehindPersistentCache.AsyncCommitStorage(Object obj)
       at Microsoft.Mashup.Evaluator.EvaluatorThreadPool.EvaluatorThread(Object state)
       at Microsoft.Mashup.Evaluator.SafeThread2.<>c__DisplayClass15.<CreateAction>b__14(Object o)
       --- End of inner exception stack trace ---
       at Microsoft.Mashup.Evaluator.EvaluationHost.<>c__DisplayClass7.<TryReportException>b__6()
       at Microsoft.Mashup.Common.SafeExceptions.IgnoreSafeExceptions(IEngineHost host, IHostTrace trace, Action action)
       at Microsoft.Mashup.Evaluator.EvaluationHost.TryReportException(IHostTrace trace, IEngineHost engineHost, IMessageChannel channel, Exception exception)
       at Microsoft.Mashup.Evaluator.EvaluationHost.TryHandleException(Exception exception)
       at Microsoft.Mashup.Evaluator.SafeThread2.HandleException(Exception e)
       at Microsoft.Mashup.Evaluator.SafeThread2.<>c__DisplayClass15.<CreateAction>b__14(Object o)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart(Object obj)
       --- End of inner exception stack trace ---
       at Microsoft.Mashup.Evaluator.EvaluationHost.OnException(IEngineHost engineHost, IMessageChannel channel, ExceptionMessage message)
       at Microsoft.Mashup.Evaluator.MessageHandlers.TryDispatch(IMessageChannel channel, Message message)
       at Microsoft.Mashup.Evaluator.MessageHandlers.Dispatch(IMessageChannel channel, Message message)
       at Microsoft.Mashup.Evaluator.ChannelMessenger.ChannelMessageHandlers.TryDispatch(IMessageChannel channel, Message message)
       at Microsoft.Mashup.Evaluator.MessageHandlers.Dispatch(IMessageChannel channel, Message message)
       at Microsoft.Mashup.Evaluator.ChannelMessenger.OnMessageWithUnknownChannel(IMessageChannel baseChannel, MessageWithUnknownChannel messageWithUnknownChannel)
       at Microsoft.Mashup.Evaluator.MessageHandlers.TryDispatch(IMessageChannel channel, Message message)
       at Microsoft.Mashup.Evaluator.ChannelMessenger.ChannelMessageHandlers.TryDispatch(IMessageChannel channel, Message message)
       at Microsoft.Mashup.Evaluator.MessageHandlers.Dispatch(IMessageChannel channel, Message message)
       at Microsoft.Mashup.Evaluator.Interface.IMessageChannelExtensions.WaitFor[T](IMessageChannel channel)
       at Microsoft.Mashup.Evaluator.RemotePreviewValueSource.PreviewValueSource.WaitFor(Func`1 condition, Boolean disposing)
       at Microsoft.Mashup.Evaluator.RemotePreviewValueSource.PreviewValueSource.get_SmallValue()
       at Microsoft.Mashup.Evaluator.Interface.TracingPreviewValueSource.get_SmallValue()
       at Microsoft.Mashup.Host.Document.Analysis.PackageDocumentAnalysisInfo.PackagePartitionAnalysisInfo.SetPreviewValue(EvaluationResult2`1 result, Func`1 getStaleSince, Func`1 getSampled)