I have Jmeter 5.6.3 Installed on linux ubuntu using command line and need to use ConcurrencyThreadGroup. So I install the ConcurrencyThreadGroup.jar and move it to lib/ext folder, but when I run the test plan in Non Gui mode I get the following error: "CannotResolveClassException: com.blazemeter.jmeter.threads.concurrency.ConcurrencyThreadGroup". So, I need your help to run the test.
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