CRON failed with python script

Hi,
I created a Django Website in Web Cloud, and I would like to create a cron job to automatically execute quick task each hour.
I created a python file which only do a print, and save it to path : ./www/exploration/migrator.py

Then I created a cron job and specify the path with langage "Other", and set occurence every hour

After 10 run, I received a mail from OVH which tell me that all my tasks failed. In the OVH log I had the following message: "Your job could not be initiated for an unknown reason. Please contact customer support for more information."

I don't understand what is wrong.

Please could you help me?

Best regards