@Saisreenath According to this article: you should be in the folder containing the script you want to execute to set the execution permissions. Nifi needs permissions to access the script. It also needs permission to be able to execute the command you gave it. In your error it is saying it cannot run the python command. You may need to adjust that command path. In summary make sure you give correct permissions to everything you put in Properties tab of the NiFi Processor, and use the correct paths for python.
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