Unexpected error: Container unexpectedly exited. Exit code: 0xC000026F. PID: 10128

(1) Share

Report

Posted on by CU28011956-0

Hi I recently tried to launch Power Query within Excel and am now unable to connect to any sources across my various queries. Posting for help lol.

Unexpected error: Container unexpectedly exited. Exit code: 0xC000026F. PID: 10128
Details:
Microsoft.Mashup.Evaluator.Interface.ErrorException: Container unexpectedly exited. Exit code: 0xC000026F. PID: 10128 ---> Microsoft.Mashup.Evaluator.ContainerExitException: Container unexpectedly exited. Exit code: 0xC000026F. PID: 10128 ---> Microsoft.Mashup.Evaluator.ContainerExitException: Container unexpectedly exited. Exit code: 0xC000026F. PID: 10128
at Microsoft.Mashup.Evaluator.ContainerProcess.WaitForContainerReady(Waitable readyEvent, Waitable exitEvent)
at Microsoft.Mashup.Evaluator.ContainerProcess.WithClientPipesAttachedEvent(String hostToContainerPipeName, Func`1 func)
at Microsoft.Mashup.Evaluator.ContainerProcess.CreateProcess()
at Microsoft.Mashup.Evaluator.ProcessContainerFactory.Container.CreateProcess(EvaluatorConfiguration configuration, String arguments, ContainerJob job)
at Microsoft.Mashup.Evaluator.ProcessContainerFactory.Container..ctor(EvaluatorConfiguration configuration, String exitMutexName, Int32 containerID, ContainerJob job)
at Microsoft.Mashup.Evaluator.ProcessContainerFactory.CreateProcessContainer()
at Microsoft.Mashup.Evaluator.WorkingSetProcessContainerFactory.CreateProcessContainer()
at Microsoft.Mashup.Evaluator.ContainerPoolContainerFactory.CreatePooledContainer(TimeSpan ttlAdjustment)
at Microsoft.Mashup.Evaluator.ContainerPoolContainerFactory.CreateContainer()
at Microsoft.Mashup.Evaluator.RemoteEvaluationContainerFactory.CreateContainer()
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.CreateContainer()
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.RemoteEvaluation.Evaluate(Boolean enableFirewall)
--- End of inner exception stack trace ---
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.RemoteEvaluation`1.TryCompleteWithException(Exception exception)
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.RemoteEvaluation.Evaluate(Boolean enableFirewall)
at Microsoft.Mashup.Evaluator.EvaluatorThreadPool.EvaluatorThread(Object state)
at Microsoft.Mashup.Evaluator.SafeThread2.<>c__DisplayClass9_0.<CreateAction>b__0(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.Host.Document.Analysis.PackageDocumentAnalysisInfo.PackagePartitionAnalysisInfo.SetPreviewValue(EvaluationResult2`1 result, Func`1 getStaleSince, Func`1 getSampled)

Categories:

Power Query

I have the same question (2)

All responses (5)

Answers (0)

Michael E. Gernaey 53,926 Super User 2025 Season 2 on at

Like (1)

Report
Copy link

Link copied!

Hi @CU28011956-0

There are many people complaining about excel issues around this topic.

Many are using specific types of devices and versions of office, can you tell me what device you have and version of office please?

Also, I would definitely check in the Power BI and Fabric forums toos.

I definitely have seen many posting in the last few days.

Was this reply helpful? Yes No
CU28011956-0 12 on at

Like (0)

Report
Copy link

Link copied!

Hi,

I am using an Apple Silicon (3.07 GHz) (4 processors) and running Parallels Windows 11 Pro. I have been able to run Power Query without issue in previous months. Microsoft Office is Version 2601 I think. Per Excel it says Version 2601 (build 19628.20150 click-to-run)

Was this reply helpful? Yes No
Suggested answer

VASANTH KUMAR BALMADI 176 on at

Like (1)

Report
Copy link

Link copied!
I’ve seen this happen a few times, especially after Office or Windows updates. When the container fails, every connector breaks and you get the “Container unexpectedly exited (0xC000026F)” error even for simple sources.

What normally fixes it:

Close Excel completely

Go to

C:\Users\<your-username>\AppData\Local\Microsoft\

Delete the Mashup folder (this is the most important one)

Reopen Excel and try Power Query again

If it still fails, open Excel → File → Options → Data and disable Fast Data Load / background preview options, then restart Excel.

If the issue started suddenly, an Online Repair of Microsoft 365 usually resolves it — Quick Repair often doesn’t.

On company laptops, this can also be caused by antivirus or endpoint protection blocking Microsoft.Mashup.Container.exe, which results in this exact error code. If that’s the case, IT needs to whitelist it.

1 people found this reply helpful.

Was this reply helpful? Yes No
CU28011956-0 12 on at

Like (0)

Report
Copy link

Link copied!

Vasanth! Thank you for the response.

1. I do not see the Mashup folder, I am guessing I may have deleted.

2. I did not see the option specifically for disable Fast Data Load/background preview but I checked all the boxes to basically disable everything in the Data section and no change.

3. I will try Online Repair again - I have done once with no change.

4. How do you whitelist a program? I don't have an IT team.

Thanks again

Was this reply helpful? Yes No
CU28011956-0 12 on at

Like (0)

Report
Copy link

Link copied!

Ok wait, I did find the options. They are in Power Query Options, not Excel for anyone else following along. I Fast load was disabled and I disabled the preview.

Was this reply helpful? Yes No