Cannot redeclare class Tracker Error

[cebula]

Hello!
I just installed SugarCRM and everything seems to work smoothly even after I installed another language pack.
Except for one detail:
When I am using the Portuguese language Pack (i am trying the second language pack now) and I try to delete the selected tasks, it returns me the following error (take a look at the attachments for detail):

Bad data passed in; Return to Home
Fatal error: Cannot redeclare class Tracker in C:\xampp\htdocs\crm\modules\Trackers\Tracker.php on line 45

When I use the en_us language pack, the problem do not happens.

I even tried uninstall e reinstall SugarCRM but the problem persists.

Do you guys have a clue about why is this happening?

Thank you very much!

Luciano

My enviroment:
SugarCRM v. 5.1.0 (Build 4732)
XAMP 1.6.7
PHP 5.2.6
APACHE 2.2.9
MYSQL 5

[noswalnod]

I have the same error in EN. I can send individual emails, but campaigns will not run because the cron job will not complete. Any ideas?