Yeah, I know… it’s a horrible blog title. But I hope Google/Bing/whatever brings you here in case you experience this error.
So you’re ready for doing some Office 2013 / SharePoint 2013 App development and happily installed Visual Studio 2012 and the Microsoft Office Developer Tools for Visual Studio 2012. You then quickly fire up Visual Studio 2012 (remember: using administrative privileges!), select the new “App for SharePoint 2013” template, work your way through the App for SharePoint settings wizard and finally press “Finish”….
BANG! The following error dialog appears:
For SEO purposes I will repeat the dialog text here:
“An error occurred while trying to load some required components. Please ensure that the following prerequisite components are installed:
Microsoft Web Developer Tools
Microsoft Exchange Web Services”
Very weird, especially since the Web Platform Installer should have taken care of these two prerequisites. Since I encountered this error yesterday, I spent some time investigating it. I actually found some references to it here and here. As you can read in those threads the culprit seems to be a pre-installed instance of the Exchange Web Services API. I remembered having installed that API a week ago to do some testing. Apparently the Web Platform Installer doesn’t correctly handle a pre-installed version of the Exchange Web Services API very well.
The solution was simple: just uninstall BOTH the Exchange Web Services API and the Microsoft Office Developer Tools for Visual Studio 2012. Then reinstall (only) the Office Developer tools. This time the Web Platform Installer will ensure the correct Exchange Web Services API is also installed. If all went well you should be able to create a new “App for SharePoint 2013” project without any problems!