MPS warnings during compile

I recently downloaded MPS and am going through the tutorials and screen casts. We're looking to incorporate a new language into our analyst workbench. When I compile, no matter what I'm compiling, I get the following warnings:

Failed to replace dynamic reference 'classifier' with static counterpart: no target; resolveInfo=jetbrains.mps.samples.Kaja.actions.ActionAspectDescriptorImpl. Dynamic reference is left intact.
Failed to replace dynamic reference 'baseMethodDeclaration' with static counterpart: no target; resolveInfo=jetbrains.mps.samples.Kaja.behavior.BehaviorAspectDescriptor. Dynamic reference is left intact.
Failed to replace dynamic reference 'classifier' with static counterpart: no target; resolveInfo=jetbrains.mps.samples.Kaja.constraints.ConstraintsAspectDescriptor. Dynamic reference is left intact.
Failed to replace dynamic reference 'classifier' with static counterpart: no target; resolveInfo=jetbrains.mps.samples.Kaja.editor.EditorAspectDescriptorImpl. Dynamic reference is left intact.
Failed to replace dynamic reference 'baseMethodDeclaration' with static counterpart: no target; resolveInfo=jetbrains.mps.samples.Kaja.intentions.IntentionsDescriptor. Dynamic reference is left intact.

The compile seems to work (I get the changed behavior I'm expecting), but I'm always leery of warnings. What do these mean, and are they anything to worry about. I also got the same warnings the first time I compiled, before changing anything.

Thanks.