Using IDEA 12.1
MPS-17661 [build:IC-999.SNAPSHOT] java.lang.IllegalArgumentException : Argument 1 for @NotNull parameter of jetbrains/mps/smodel/constraints/ModelConstraints.canBeParent must not be null: Argument 1 for @NotNull parameter of jetbrains/mps/smodel/constraints/ModelConstraints.canBeParent must not be null
MPS-17662 [build:IC-999.SNAPSHOT] java.lang.NullPointerException