kloadgen unsupported serializer

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Friends,

I'm using JMeter 5.6 with KLoadGen.

I'm trying to configure a producer to use Avro for the value but string ser=
ializer for the key.  Is that supported?  It works fine from my java code b=
ut the plugin doesn't like it.

My config has schema registry, producer, and KLG - Value Schema Serializer =
Config, which seems to be the value.  In addition, I've tried no key serial=
izer, KLG - Key Schema Serializer Config (but I don't really want this,) an=
d KLG - Simple Key Config.

With KLG - Simple Key Config, I tried setting the key class type to string =
and the serializer to StringSerializer.  In this case, I get this partial s=
tack trace:

com.sngular.kloadgen.exception.KLoadGenException: Unsupported Serializer
    at com.sngular.kloadgen.sampler.SamplerUtil.configureKeyGenerator(Sampl=
erUtil.java:427) ~[kloadgen-5.6.12.jar:?]
    at com.sngular.kloadgen.sampler.KafkaProducerSampler.setupTest(KafkaPro=
ducerSampler.java:73) ~[kloadgen-5.6.12.jar:?]

I get that same error with no key serializer at all.

With the key schema serialization config, I get the same message but from a=
 different location in the code:

com.sngular.kloadgen.exception.KLoadGenException: Unsupported Serializer
    at com.sngular.kloadgen.sampler.SamplerUtil.getBaseLoadGenerator(Sample=
rUtil.java:471) ~[kloadgen-5.6.12.jar:?]
    at com.sngular.kloadgen.sampler.SamplerUtil.configureKeyGenerator(Sampl=
erUtil.java:425) ~[kloadgen-5.6.12.jar:?]
    at com.sngular.kloadgen.sampler.KafkaProducerSampler.setupTest(KafkaPro=
ducerSampler.java:73) ~[kloadgen-5.6.12.jar:?]

What am I doing wrong?

Thanks


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