FlexUnit 4.1 Beta 1 turnkey project doesn't build

Getting the following error after setting up the project:

Could not resolve <flexUnitUIRunner:TestRunnerBase> to a component implementation.    flexunit-test/src    FlexUnit4Turnkey.mxml    line 86

Any ideas? Clearly, things have moved around quite a bit (always a fun thing to push out in a minor release), but I can't figure out what I should be using instead of TestRunnerBase.