OK it seems a very common error causing many people the same head ache
I did the following...
For VestaCP SSH to your server as root and enter following commands :
/usr/local/vesta/php/bin/php /usr/local/vesta/softaculous/cron.php
Now i see eight errors in the cron file on putty terminal
all different errors
/usr/local/vesta/bin/v-list-user: line 17: /func/main.sh: No such file or directory
/usr/local/vesta/bin/v-list-user: line 156: check_args: command not found
/usr/local/vesta/bin/v-list-user: line 157: is_object_valid: command not found
/usr/local/vesta/bin/v-list-user: line 167: /data/users/admin/user.conf: No such file or directory
/usr/local/vesta/bin/v-list-user: line 17: /func/main.sh: No such file or directory
/usr/local/vesta/bin/v-list-user: line 156: check_args: command not found
/usr/local/vesta/bin/v-list-user: line 157: is_object_valid: command not found
/usr/local/vesta/bin/v-list-user: line 167: /data/users/admin/user.conf: No such file or directory