Hi,

I'm trying to run a scan via exported vectors.yml file from previous recording using arachni proxy plugin, there's some errors occurred and arachni didn't found any issue. With normal scan (visiting target url via proxy and scan using the same arachni instance) it can found an issue, but if I export the vectors and use that in another arachni instance using vector_feed plugin it doesn't work, when I look through the log arachni did found the issue, then there's error regarding the browser cluster "undefined method `to_msgpack' for #Arachni::Element::Header:0x00000002d2f378"

when using same instance I use this command:
./arachni --plugin='proxy' --checks=xss* --scope-page-limit=0 http://testphp.vulnweb.com

when using vector_feed:
./arachni --plugin="vector_feed:yaml_file=vectors.yml" --checks=xss* --scope-page-limit=0 http://testphp.vulnweb.com

Here's I attached the vector file and the logs snipplet.