Hello I ran into the same error message while trying to setup the add-on for onefs 9.1.0.8 the issue is located in the setup script as you can see in this log from /opt/splunk/var/log/splunk/python.log 2021-08-24 17:46:19,721 ERROR list index out of range Traceback (most recent call last): File "/opt/splunk/lib/python3.7/site-packages/splunk/rest/__init__.py", line 199, in dispatch methodOutput = method() File "/opt/splunk/etc/apps/TA_EMC-Isilon/bin/isilon_setup.py", line 155, in handle_POST major_version = release_version.split('v')[1].split('.')[0] IndexError: list index out of range When i tried to connect to https://cluster:8080/platform/1/cluster/config and search for "release:" . it has this format "release" : "9.1.0.8" I guess the python script expects a format like "release" : "v9.1.0.8" so i commented line 155 and replaced it with major_version = release_version.split('.')[0] and the setup now works as expected The heavy forwarder is on version 8.2 and the add-on on version 2.7 ... View more