这意味着任务花费的时间超过一秒，并且默认情况下，给定的作业只允许一个并发执行.在不知道任务是什么的情况下，我无法告诉你如何处理这个问题.

It means that the task is taking longer than one second and by default only one concurrent execution is allowed for a given job. I cannot tell you how to handle this without knowing what the task is about.