Hello, Abaqus users

I'm trying to simulate a simple particle generator.

Model is almost nothing.
There is a discrete rigid shell planar, Generator, where the particles are supposed to be generated.
A discrete rigid shell revolution part,Bowl, is underneath of the Generator

I created particle generating codes based on official SIMULIA User Assistance.
I have gone through the debugging processes to resolve all the errors
Now I have one error that I cannot deal with it.

Please help!

Thank you,
Je pyo Hong

P.S. Is coding only way to create particle generator? I prefer to use CAE with comfortable UI.

[Update] 30 Mar. 2020
Please check the recent reply below