We don't know what happened, but something went wrong. Could you please try that again?

I created a new web application and site collection on SharePoint 2013 Enterprise. Everything worked great until the users tried to open Excel documents.

They were challenged with and Excel Services error: We don't know what happened, but something went wrong. Could you please try that again?

The issue was that the document library was configured to open documents in the browser as it's default behavior. I changed it to Client Application and all was working as expected.

Go into Site Contents click the three dotted menu then Settings.
Go to Advanced Settings:

Select Open in the client application:
If you are truly trying to get Excel Services to handle the file, you will need to configure this as a trusted site and perhaps modify the permissions on the Temp directory to allow the application pool account to modify.


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