[grace1004]

cron jobs are executed based on the server root file system,
not public_html directory. So, the path for included or required
files should be expressed in absolute path as follows:

require_once("/home/a******/public_html/folder/EasyBotter.php"); //changed later

For frequency setting, I recommend not to set 0 for minutes
and hours, which did not work when I tested in the past.
With the same code, when I set the frequency with */5 * * * *
it worked fine.

After changing your code as suggested above, if the cron job still does not
work, please set the permission of 'folder' and 'cron.php' to 0777.