"markerClass":
"com.di.jmeter.config.ExtendedCsvDataSet",
But i think maybe it should be
"markerClass":
"com.di.jmeter.config.ExtendedCsvDataSetConfig",
Because here:
https://github.com/rollno748/Extended-csv-dataset-config/blob/master/src/main/java/com/di/jmeter/config/ExtendedCsvDataSetConfig.java
there is Config within the name but my knowledge is limited and I may have completely misunderstood.
I am unable to test my theory. Can anyone help?