[quietcoolone]

Apparently, i tried to install the module, and the previous installation was not completed properly.

To fix the error, apply the following SQL patches to your X-Cart database:

ALTER TABLE `xcart_customers` DROP COLUMN `braintree_customer_id`;
DROP TABLE `xcart_braintree_account`;
DELETE FROM xcart_languages WHERE name LIKE 'lbl%_braintree_%';
DELETE FROM xcart_modules WHERE module_name='Braintree';
DELETE FROM xcart_ccprocessors WHERE processor='cc_braintree.php';

After that, try to install the module once again.