When I try to add to queue in the development environment I get:

java.lang.RuntimeException: org.quartz.SchedulerConfigException:
Unable to instantiate class load helper class:
org.quartz.simpl.CascadingClassLoadHelper cannot be cast to
org.quartz.spi.ClassLoadHelper [See nested exception:
java.lang.ClassCastException:
org.quartz.simpl.CascadingClassLoadHelper cannot be cast to
org.quartz.spi.ClassLoadHelper]
        at
com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.startScheduler(LocalTaskQueue.java:
433)

....

Caused by: org.quartz.SchedulerConfigException: Unable to instantiate
class load helper class: org.quartz.simpl.CascadingClassLoadHelper
cannot be cast to org.quartz.spi.ClassLoadHelper [See nested
exception: java.lang.ClassCastException:
org.quartz.simpl.CascadingClassLoadHelper cannot be cast to
org.quartz.spi.ClassLoadHelper]
        at
org.quartz.impl.StdSchedulerFactory.instantiate(StdSchedulerFactory.java:
549)
        at
org.quartz.impl.StdSchedulerFactory.getScheduler(StdSchedulerFactory.java:
1152)
        at
org.quartz.impl.StdSchedulerFactory.getDefaultScheduler(StdSchedulerFactory.java:
1168)
        at
com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.startScheduler(LocalTaskQueue.java:
423)

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