Can't Add the threadgroup after build and install instructions

[dandgelb]

After using the build instruction, right click to add thread group not working in JMeter UI:
PF below the console logs:

Environment:

• Ubuntu 16.04 LTS
• apache-jmeter-3.1

Uncaught Exception java.lang.ExceptionInInitializerError. See log file for details.
Uncaught Exception java.lang.NoClassDefFoundError: Could not initialize class org.apache.jmeter.gui.util.MenuFactory. See log file for details.
Uncaught Exception java.lang.NoClassDefFoundError: Could not initialize class org.apache.jmeter.gui.util.MenuFactory. See log file for details.
Uncaught Exception java.lang.NoClassDefFoundError: Could not initialize class org.apache.jmeter.gui.util.MenuFactory. See log file for details.
Uncaught Exception java.lang.NoClassDefFoundError: Could not initialize class org.apache.jmeter.gui.util.MenuFactory. See log file for details.

[erlanggaelfallujah]

Thx @dandgelb , I think its because conflicting jar with different implementation present. Try to delete old version library (in lib directory) on the same name, so remains only new version.

cheers

[PokerBot]

I had the same issue using Apache jMeter 3.2 and the conflicting jar was the two groovy jars (groovy-all-2.4.6.jar and groovy-all-2.4.10.jar).

So I removed the 2.4.6 jar and I no longer receive the errors above, but I do not see any of the jpos sampler in jMeter and when I try to open one of the test-jmeter-jpos.jmx I get the following errors in the attached image: