Unknown error while running Aggregate jar

How did you solve this error?
am getting the same


@AlexKaranja I've split your thread because it's not clear this is the same problem. What version of Java are you running? And what version of ODK Aggregate?

@yanokwa Thanks i noticed the same problem had been posted by a different person here and you had recomended He/she use Java 8 instead of Java 9
However I was getting the same error and i was on Java 8 and Aggregate v1.4.15 but i bumped into a solution online and it worked.
I think the problem was execution of this
My workaround was to execute it manually and follow the rest of the steps as per the documentation on installation.