hovida on "wp-cron.php - wp_mail not working"

Hey guys,

i wrote a simple Plugin for sending mails over the cronjob.
WP_CRON is disabled and outsourced to crontabs on the server, for example:

* * * * * /usr/bin/php5 -f /homepages/23/d471228603/htdocs/wp-cron.php >> /homepages/23/d471228603/htdocs/cron.log

Here is the source: http://pastebin.com/tA4JgEBC

Description:
For testing, i use the direct-link to wp-cron on my Browser (for example: http://domain.com/wp-cron.php)

When i use the wp_mail function first time, i become an PHP Error:

Fatal error: Cannot redeclare class phpmailerException in /homepages/23/d471228603/htdocs/wp-includes/class-phpmailer.php on line 2825

After reloading the page will be blank/white. The printing of display_name and email of the users will be not printed.

Can anyone tell me why this does not work?

I would like to use WordPress-own functions and needs wp_mail here.