Error processing checkout – paypal plus

Hi,

I cannot proceed to checkout page and I got some errors in my log data:

[20-12-2016 08:31:56] PayPal\Core\PayPalHttpConnection : INFO: Response Status : 400
[20-12-2016 08:31:56] PayPal\Core\PayPalHttpConnection : DEBUG: Response Headers : HTTP/1.1 400 Bad Request, Date: Tue, 20 Dec 2016 08:31:56 GMT, Server: Apache, paypal-debug-id: 97923d025565, Content-Language: *, Connection: close, Connection: close, Paypal-Debug-Id: 97923d025565, Set-Cookie: X-PP-SILOVER=name%3DLIVE6.API.1%26silo_version%3D880%26app%3Dplatformapiserv%26TIME%3D2095863896%26HTTP_X_PP_AZ_LOCATOR%3D; Expires=Tue, 20 Dec 2016 09:01:56 GMT; domain=.paypal.com; path=/; Secure; HttpOnly, Set-Cookie: X-PP-SILOVER=; Expires=Thu, 01 Jan 1970 00:00:01 GMT, Vary: Authorization, Content-Length: 454, Cache-Control: max-age=0, no-cache, no-store, must-revalidate, Pragma: no-cache, Content-Type: application/json, ,
[20-12-2016 08:31:56] PayPal\Core\PayPalHttpConnection : ERROR: Got Http response code 400 when accessing https://api.paypal.com/v1/payments/payment. {“name”:”VALIDATION_ERROR”,”details”:[{“field”:”transactions[0].amount”,”issue”:”Transaction amount details (subtotal, tax, shipping) must add up to specified amount total”},{“field”:”transactions[0]”,”issue”:”Item amount must add up to specified amount subtotal (or total if amount details not specified)”}],”message”:”Invalid request – see details”,”information_link”:”https://developer.paypal.com/docs/api/#VALIDATION_ERROR”,”debug_id”:”97923d025565″}
[20-12-2016 08:31:56] PayPal\Core\PayPalHttpConnection : DEBUG:

I recognized that the error appears only when I use a coupon code. Can you help me?

Kind regards,

Simon