I am currently going through an upgrade of our JMeter instances from 5.2.1 to 
5.4.3.

Most of our existing scripts were generated in JMeter 5.2.1, and all have been 
modified in such so they are all compliant with 5.2.1.

When I try to open any of my scripts with either the default JMeter properties 
files, or our customised properties files we get an exception
java.lang.NoSuchMethodError: 
org.apache.jmeter.save.converters.HashTreeConverter.readBareItem

The full log sanitised log file has been included in the exception in a clean 
instance of jmeter 5.4.3.

The script being loaded (portalLogOut.jmx) is one of our simplest. It was 
created in 5.2.1 and contains a single TestFragmentController, which contains a 
HttpTestSamplerGui, JSR223PostProcessor and Header Manager.

As we are not undertaking a major release upgrade, I was expecting this to be a 
trivial move.

I am struggling to find any other evidence of this occurring in the wild but 
also cannot find a recommended upgrade path from 5.2.1 to 5.4.3.

I would like to avoid going through every version in between if I can.

Any advice on how to resolve this issue?

Thanks

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