Error: Assertion failed: Tandem was required but not supplied
at window.assertions.assertFunction (https://bayes.colorado.edu/continuous-testing/snapshot-1492779585423/assert/js/assert.js:21:13)
at Tandem.addInstance (https://bayes.colorado.edu/continuous-testing/snapshot-1492779585423/tandem/js/Tandem.js?bust=1492785121423:86:21)
at GaugeNode.setTandem (https://bayes.colorado.edu/continuous-testing/snapshot-1492779585423/scenery/js/nodes/Node.js?bust=1492785121423:3467:22)
at GaugeNode.set tandem [as tandem] (https://bayes.colorado.edu/continuous-testing/snapshot-1492779585423/scenery/js/nodes/Node.js?bust=1492785121423:3472:32)
at https://bayes.colorado.edu/continuous-testing/snapshot-1492779585423/scenery/js/nodes/Node.js?bust=1492785121423:4763:25
at u (https://bayes.colorado.edu/continuous-testing/snapshot-1492779585423/sherpa/lib/lodash-4.17.4.min.js?bust=1492785121423:5:432)
at Function.ru (https://bayes.colorado.edu/continuous-testing/snapshot-1492779585423/sherpa/lib/lodash-4.17.4.min.js?bust=1492785121423:67:656)
at GaugeNode.mutate (https://bayes.colorado.edu/continuous-testing/snapshot-1492779585423/scenery/js/nodes/Node.js?bust=1492785121423:4750:9)
at new GaugeNode (https://bayes.colorado.edu/continuous-testing/snapshot-1492779585423/scenery-phet/js/GaugeNode.js?bust=1492785121423:147:10)
at new NetForceScreenView (https://bayes.colorado.edu/continuous-testing/snapshot-1492779585423/forces-and-motion-basics/js/netforce/view/NetForceScreenView.js?bust=1492785121423:129:27)
Approximately 4/21/2017, 6:59:45 AM