While running Jmeter script with Appian, we are getting following error -

sagarl511 Did you ever figure this out? I'm encountering the same error.

A post from 2015 by charlesb454 :- If you search news feed using APNX-1-4215-002 you can find this message. This might help you.
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charlesb454 Thanks for the FYI! After further trial and error I succeeded posting a sail form as part of a JMeter test. Not an easy task though, since you need to inspect specific http response and pass back uuid, context and widget ids (these aren't static) to following request(s). Turns out the message "Reason: Invalid Context (APNX-1-4215-002)" is accurate. Thanks! "