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Q1: error in JMeter filename must not be null or empty

2022-06-24 19:50:00 【Find bugs by rolling circles】

1、 Error log

java.lang.IllegalArgumentException: Filename must not be null or empty
   at org.apache.jmeter.services.FileServer.reserveFile(FileServer.java:256) ~[ApacheJMeter_core.jar:5.3]
   at org.apache.jmeter.config.CSVDataSet.iterationStart(CSVDataSet.java:190) ~[ApacheJMeter_components.jar:5.3]
   at org.apache.jmeter.control.GenericController.fireIterationStart(GenericController.java:398) ~[ApacheJMeter_core.jar:5.3]
   at org.apache.jmeter.control.GenericController.fireIterEvents(GenericController.java:390) ~[ApacheJMeter_core.jar:5.3]
   at org.apache.jmeter.control.GenericController.next(GenericController.java:159) ~[ApacheJMeter_core.jar:5.3]
   at org.apache.jmeter.control.LoopController.next(LoopController.java:134) ~[ApacheJMeter_core.jar:5.3]
   at org.apache.jmeter.threads.AbstractThreadGroup.next(AbstractThreadGroup.java:91) ~[ApacheJMeter_core.jar:5.3]
   at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:254) [ApacheJMeter_core.jar:5.3]
   at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181]

2、 reason

There are those that have not been filled in CSV Data Set Config