RuntimeError: java.lang.ArithmeticException: / by zero

Thank you for sharing this.
Kindly try with ALOS-2 because I have faced this problem several times with the data sets.

ALOS-2 data works as well. I don’t know what you were doing.
Were they downloaded from JAXA directly?

Yes, the data was downloaded from JAXA.
I actually tried the process in another system and it worked fine.
I guess the issue maybe with either the system performace or I have been using an older version of SNAP.
Thank you though for working it out.