@alex-uxlabsmx should work now. there were a couple of issues in the crontab:
'&' in the end of the cron line. this puts the command in the background. cronjobs are not run in background and instead run on a schedule. so, the '&' should be removed.
'source' command is a bash primitive. you have to wrap it in bash -c "source ... && anothercommand", for example
seems to work after that.