(Another) error opening a document in a Office Web App of SharePoint 2010: “PowerPoint Web App encountered an error. Please try again.”

… on the SharePoint 2010 with german system language of my customer the message text was “Fehler bei PowerPoint Web App. Wiederholen Sie den Vorgang.”

PowerPointWebAppError-1

In the SharePoint log I found this lines:

PowerPointWebAppError-2

First: “Could not find default ServiceProxy or it does not implement IWacServiceApplicationProxy”

Second: “Unhandled exception caught when executing web method handler: System.NullReferenceException”

The Solution:

There was a missing setting for the Service Application Default Proxy Group

Go to: Central Administration –> Application Management –> Configure service application association  ==> click the link (e.g. “default”) in column “Application Proxy Group” of your web application.

You should see something like that:

PowerPointWebAppError-3

Check the missing proxy. Click OK. That’s it…

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