ContinuousTask的文档中的第1个示例运行失败

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$\tt ContinuousTask$文档中的第1个示例运行失败
Lookup::invrl: The argument Developer`FromJSON[{error->ScheduledTask::restr}] is not a valid Association or a list of rules.
ToExpression::notstr: The format type InputForm is valid only for string input.