replay_mineral.py returns empty output

[bw-leran]

I'm trying to get replay data from .SC2Replay files by running replay_minerals.py. The program runs successfully but outputs empty arrays and values. I've tried several different replay files. Here is a sample output:

============================================= Summary 10 secs =============================================
Replays: 0, Steps total: 0

Camera move: 0, Select pt: 0, Select rect: 0, Control group: 0

Maps: 0
{}

Races: 0
{}

Unit ids: 0
{}

Valid abilities: 0
{}

Made abilities: 0
{}

Valid actions: 0
{}

Made actions: 0
{}

Crashing replays: 0
[]

Invalid replays: 0
[]
---------------------------------------------- Process stats ----------------------------------------------
[ 0] replay: , replays: 0, steps: 0, game loops: 0, last: launch, 9 s ago

The program then finishes with 0 exit code.

Any ideas of what I should try to get this file to work properly?