Builds fail because Xcode can't find storyboards it just moved.

Hi all.


I got tired of hunting through the file tree for my storyboards, so I put them in a group using the Xcode file browser pane (right-click on project, create group, drag storyboards in).


On the next build, Xcode inexplicably complained that it couldn't find the files. Yet there they are, listed in the project treeview and editable by clicking on them.


Anyone have a workaround for this bug?


Thanks!