Looking at MessagerParser.pm, get_class() is called on the "class_resolver".

The documentation mentions this snippet:

 my $parser = SOAP::WSDL::Expat::MessageParser->new({
    class_resolver => 'My::Resolver'
 });
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It looks like a SOAP::WSDL::Expat::MessageParser is getting constructed with no class resolver specified. But the referenced docs about how to make a class resolver don't seem to actually put the pieces together about how you tell SOAP::WSDL which resolver to use. I suppose the "generator" is supposed to just take of that for you.

So perhaps you need to double check how you ran the generator or look at what it generated to figure out the missing piece?

(In case you haven't noticed, I have no experience with using SOAP.)