Intermittent Swift Framework Compiler Error <p>I am trying out Swift in the XCode beta. In particular using an @IBDesignable and @IBInspectable. I am building a framework containing an (@IBDesignable) UIView subclass and a Simple iOS App in order to test it out (Both contained in and linked via a workspace). After a few successful builds I get the following error in the framework build output:</p> <p>:0: error: /Users/richardpj/Projects/Swift2/Swift2FW/build/Swift2FW.build/Debug-iphonesimulator/Swift2FW.build/unextended-module.modulemap:2: umbrella header 'Swift2FW.h' not found :0: error: could not build Objective-C module 'Swift2FW'</p> <p>Before you ask I've done a clean and deleted my derived data but nothing seems to resolve it except deleting and recreating the workspace and project files.</p> <p>Any ideas on the source of the error, how to replicate (for a bug report) OR am I being dumb.</p> <p><strong>EDIT:</strong> I've gotten 50 views since this was posted. Sounds like it's a bug I should report. Any ideas on how to do that?</p>