Sample wind energy *.tsv file is empty

[PhillipFromOZ]

I've run:
java -cp termsuite-core-3.0.10.jar fr.univnantes.termsuite.tools.TerminologyExtractorCLI
-t ./treetagger/
-c ./wind-energy/English/txt/
-l en
--tsv ./wind-energy-en.tsv
However the wind-energy-en.tsv is empty:

type key freq

Java version:
java version "1.8.0_251"
Java(TM) SE Runtime Environment (build 1.8.0_251-b08)
Java HotSpot(TM) 64-Bit Server VM (build 25.251-b08, mixed mode)

OS:
AWS Linux

There are no log files

Can you please tell me why the output is blank?