https://community.cloudera.com/t5/Support-Questions/javax-script-ScriptException-NameError-name-s-is-not-defined/m-p/226769#M188629 <P>So along the flow I have an attribute, which is called asin (aka product ID). The flow should fail when an ID already exists in a local csv file. With your help I changed my code to</P><PRE>#!/usr/bin/python import os import java.io flowFile = session.get() productFound = False if (flowFile != None): if os.path.exists('/home/nifi/products.csv'): asin = flowFile.getAttribute('asin') with open('/home/nifi/products.csv') as csv: if asin in csv.read(): productFound = True if productFound: session.transfer(flowFile, REL_FAILURE) else: session.transfer(flowFile, REL_SUCCESS) </PRE><P>I falsely assumed that I could call REL_FAILURE/SUCCESS multiple times.</P> Tue, 06 Nov 2018 15:23:41 GMT artworkad 2018-11-06T15:23:41Z