Why doesn't Job work?

Question

Task Schedulers

Hello.
Created a job in crontab as root

# job 
1 19 * * * /opt/project1/start.sh

in the
tail /var/log/cron log, I
believe the Job was sent for execution

May 11 19:01:01 server01 CROND[127428]: (root) CMD (/opt/project1/start.sh)

As a result, a notification should come to the mail, BUT it did not come.
If you run /opt/project1/start.sh on the forehead, then everything works out.
What could be the problem and how to solve it?

Answer 1

I ran into a similar problem and solved it like this:
cd /opt/project1/ && ./start.sh

Answer 2

decided like this
/data/Anaconda2-4.4.0/envs/python36/bin/python opt/project1/Table_Control.py opt/project1/connection.yaml
BUT I still don't understand why the same script is interpreted differently if to run it from the shell, then there is no problem, but if through cron, then some other environment is selected ....