TypeError: this.model.getOverlappingBiomolecules is not a function
at TranscriptionFactor.handleReleasedByUser (http://phettest.colorado.edu/gene-expression-essentials/js/common/model/TranscriptionFactor.js?bust=1474394404283:85:40)
at Array. (http://phettest.colorado.edu/gene-expression-essentials/js/common/model/MobileBiomolecule.js?bust=1474394404283:96:14)
at Emitter.emit2 (http://phettest.colorado.edu/axon/js/Emitter.js?bust=1474394404283:139:49)
at Property._notifyObservers (http://phettest.colorado.edu/axon/js/Property.js?bust=1474394404283:146:29)
at Property._setAndNotifyObservers (http://phettest.colorado.edu/axon/js/Property.js?bust=1474394404283:134:14)
at Property.set (http://phettest.colorado.edu/axon/js/Property.js?bust=1474394404283:102:16)
at TranscriptionFactor.set [as userControlled] (http://phettest.colorado.edu/axon/js/PropertySet.js?bust=1474394404283:157:43)
at end (http://phettest.colorado.edu/gene-expression-essentials/js/common/view/BiomoleculeDragHandler.js?bust=1474394404283:41:36)
at BiomoleculeDragHandler.endDrag (http://phettest.colorado.edu/scenery/js/input/SimpleDragHandler.js?bust=1474394404283:165:26)
at Object.up (http://phettest.colorado.edu/scenery/js/input/SimpleDragHandler.js?bust=1474394404283:74:16)