Script Expression stopped working after upgrading to April 2018 Release.
After upgrading to the April 2018 release, some script expressions started to fail and affected devices are not updating.
Scripts give throws exception:
Method not found: 'Jint.JintEngine Extender`1.get_Engine()'
The April release features a new faster scripting engine.
Upgrade all plugins and your scripts will start working again. Use the "Update All" button.