Article ID: 2796622 - View products that this article applies to.
Not sure what release of Office 365 you're using? Go to the following Microsoft website:
Am I using Office 365 after the service upgrade?
When you try to change the master page for a Microsoft SharePoint Online site from inside the "Look and Feel" section of the site settings, you receive the following error message:
An Unexpected Error has occurred.
To work around this issue, follow these steps:
This issue occurs after you receive the latest SharePoint Online service update. The product team is working to resolve the issue as soon as possible.
Still need help? Go to the Office 365 Community
Article ID: 2796622 - Last Review: February 27, 2013 - Revision: 4.0