ReactRouter -- Questions in meteor

Slightly off topic, but i am really confused how to get the react router to work with Meteor. I don’t know what the createElement should be null, my components definitely work.

Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components). Check the render method of Router.warning @ warning.js:45ReactElementValidator.createElement @ ReactElementValidator.js:221render @ createRouter.js:502ReactCompositeComponentMixin._renderValidatedComponentWithoutOwnerOrContext @ ReactCompositeComponent.js:587ReactCompositeComponentMixin._renderValidatedComponent @ ReactCompositeComponent.js:607wrapper @ ReactPerf.js:66ReactCompositeComponentMixin.mountComponent @ ReactCompositeComponent.js:220wrapper @ ReactPerf.js:66ReactReconciler.mountComponent @ ReactReconciler:37ReactCompositeComponentMixin.mountComponent @ ReactCompositeComponent.js:225wrapper @ ReactPerf.js:66ReactReconciler.mountComponent @ ReactReconciler:37mountComponentIntoNode @ ReactMount.js:266Mixin.perform @ Transaction.js:136batchedMountComponentIntoNode @ ReactMount.js:282Mixin.perform @ Transaction.js:136ReactDefaultBatchingStrategy.batchedUpdates @ ReactDefaultBatchingStrategy:62batchedUpdates @ ReactUpdates.js:94ReactMount._renderNewRootComponent @ ReactMount.js:476wrapper @ ReactPerf.js:66ReactMount._renderSubtreeIntoContainer @ ReactMount.js:550ReactMount.render @ ReactMount.js:570wrapper @ ReactPerf.js:66(anonymous function) @ parooz.cjsx:177dispatchHandler @ createRouter.js:381(anonymous function) @ createRouter.js:349(anonymous function) @ Transition.js:69(anonymous function) @ Transition.js:69(anonymous function) @ Transition.js:69Transition.to @ Transition.js:72(anonymous function) @ createRouter.js:348Transition.from @ Transition.js:51dispatch @ createRouter.js:345refresh @ createRouter.js:396run @ createRouter.js:392runRouter @ runRouter.js:45(anonymous function) @ parooz.cjsx:175runStartupCallbacks @ startup_client.js:30ready @ startup_client.js:32
invariant.js:39 Uncaught Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. Check the render method of Router.