I can't get my Python program (which runs in Terminal with no problem) to run through cron.
Here's the crontab command I use:
38 11 * * * /usr/bin/python3 /home/pi/Cascades2/03_face_recognition.py >> /home/pi/Cascades2/cron.log 2>&1
The error message that appears in the cron.log file is:

: cannot connect to X server

What's the problem?
Like tocode suggested, adding export DISPLAY=:0.0 && to the script works perfectly.
38 11 * * * export DISPLAY=:0.0 && /usr/bin/python3 /home/pi/Cascades2/03_face_recognition.py >> /home/pi/Cascades2/cron.log 2>&1
Unable to run a Python program with cron: cannot connect to X server