Group level processing stuck on "Matplotlib is building the font cache; this may take a moment."

[kbkatebray]

What happened?
I have completed the pre-processing/first level using Halfpipe and am attempting to run the group level statistics. I am using the cluster. I am using a very small subset of my data to test (8 participants). First level consisted of running seed-based connectivity and dual regression. Group level I just specified one linear model.
I get the following messages in the terminal:
[halfpipe ] [IMPORTANT] Option "--verbose" was not specified. Will not print detailed logs to the terminal.
└─Detailed logs information will only be available in the "log.txt" file in the working directory.
Then "Matplotlib is building the font cache; this may take a moment." prints approximately 50 times and then nothing else happens. It can stay like this for a few hours. No group level directories are created.

Is there an error message?
No additional messages get printed to the log.txt, halfpipe.log.txt or err.txt files.

What is the exact command that you used to run Halfpipe?
To run the group level I ran the following commands:
Requesting interactive job on cluster : sinteractive -p interactive --time=01:00:00
load singularity: module load singularity/3.5.3
singularity run --no-home --cleanenv --bind /:/ext halfpipe_1.1.0.sif --only-model-chunk
Then the user interface opened, I selected my output directory and then selected 'Run without modification'.

Which settings did you use?
spec.json file contents attached in txt
spec.json.txt

Thanks in advance for your help!

[HippocampusGirl]

I did some testing, and it seems the issue comes from a missing environment variable.

I will let you know once the fix is available for download so that you can test it.