I am applying discount on cart by following the link
discount apply on cart but my problem is that when i checkout using paypal it redirects back me to cart and print the following error
PayPal gateway has rejected request. The totals of the cart item amounts do not match order amounts (#10413: Transaction refused because of an invalid argument. See additional error messages for details).
When i go through the log i found the following message
exception 'Mage_Core_Exception' with message 'PayPal NVP gateway errors: Array Correlation ID: b1fffcad18843. Version: 72.0.'