Why does "kill" always happen when preprocessing but no error is raised?

[wplf]

Hi, there.
Thank you for great works.

I encountered killed with no reason when I was preprocessing dataset. But no error was raised.
Have you encountered this problem before?

This is my teminal output:

deeph-preprocess --config ./preprocess_default.ini
User config name: ['./preprocess_default.ini']
Found 1 directories to preprocess
Preprocessing No. 1/1 [08:00:00<?]...Output subdirectories: OUT.SIC-BI
[1]    33132 killed     deeph-preprocess --config ./preprocess_default.ini