This is a quickie for anybody using Team Development for Sitecore (TDS) and encountering the mysterious “The package builder failed” error. In my scenario, the builder fails and informs you to check the build output log, but there are no build output log details. This makes debugging the issue rather difficult…

The only resource I could find using Google was a thread on Twitter. That thread implied an incorrect drop-down value in the project file for the Recursive Deploy Action. That did not solve it for me, unfortunately.

In the end, the problem turned out to be that after I renamed a TDS project, the multi-project references were not updated. It still referenced the old project folder and project file name.

<BundledProject Include="..\OldProjectFolder\OldProjectName.scproj">

I manually updated the project file using a text editor to match to my new project filename and folder and this fixed it right up! Hopefully this article helps you when you are searching the web for a solution to this mysterious error without log details!