@hidden  Welcome to the world of Apache NiFi.  The first recommendation I'd make is to download the latest version of Apache NiFi 1.x branch.  The 1.12 branch is more then 5 years old now and there have been so many improvements, bug fixes, and security updates since its release. The new Apache NiFi 2.x branch has also been released recently.  Since you are new to NiFi you may also consider utilizing the 2.x version instead to avoid hassle down the road of migrating to this new major release branch.  The 1.x branch will cease to release new versions soon. When sharing exceptions for help is is best to make sure you have also inspected the NiFi-Registry logs produced in the log directory you have configured in the logback.xml file.  They may provide more detailed stack traces and/or logging to help fully understand the issue you encountered.   Thank you, Matt ... View more