Ubuntu crontab Not running script?

Question

ubuntu

crontab -e
#
# mh dom mon dow command
12 * * * * . /home/web/sitecheker/cron_run.sh
script content
#! /bin/bash
workon sitecheker
python /home/web/sitecheker/run.py
deactivate
If just run in console . /home/web/sitecheker/cron_run.sh , everything works fine. It does n't start with cron. I don't run it
as root.
What could be the problem? I already broke my head

Answer 1

Apparently, you do not have environment variables specified. Write the full path /usr/bin/python.