视频里面使用.windowAll(TumblingProcessingTimeWindows.of(Time.seconds(3)))，为什么使用windowAll(TumblingEventTimeWindows.of(Time.seconds(3)))报错?
是因为产生的数据中没有时间的关系吗？能不能用在windowall();

Caused by: java.lang.RuntimeException: Record has Long.MIN_VALUE timestamp (= no timestamp marker). Is the time characteristic set to 'ProcessingTime', or did you forget to call 'DataStream.assignTimestampsAndWatermarks(...)'?
	at org.apache.flink.streaming.api.windowing.assigners.TumblingEventTimeWindows.assignWindows(TumblingEventTimeWindows.java:83)
	at org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.processElement(WindowOperator.java:302)
	at org.apache.flink.streaming.runtime.tasks.OneInputStreamTask$StreamTaskNetworkOutput.emitRecord(OneInputStreamTask.java:205)
	at org.apache.flink.streaming.runtime.io.AbstractStreamTaskNetworkInput.processElement(AbstractStreamTaskNetworkInput.java:134)
	at org.apache.flink.streaming.runtime.io.AbstractStreamTaskNetworkInput.emitNext(AbstractStreamTaskNetworkInput.java:105)
	at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:66)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:423)
	at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:204)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:684)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.executeInvoke(StreamTask.java:639)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.runWithCleanUpOnFail(StreamTask.java:650)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:623)
	at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:779)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:566)
	at java.lang.Thread.run(Thread.java:748)