paypal支付问题，报Authorisation to PayPal failed错

[shikyoh]

后台paypal参数都设置完毕了。
但在确认paypal支付后,报的此错误 如下：
Please refer to logs:

Making new connection to 'api-3t.sandbox.paypal.com/nvp'
Connect with CURL method sucessfull
Sending this params:
METHOD=SetExpressCheckout&VERSION=53.0&PWD;=*********&USER=acctpay_api1.vastrades.com&SIGNATURE;=*********&Amt=294.98&PAYMENTACTION=Sale&ReturnUrl=http://www.pnjone.com/modules/paypalapi/payment/submit.php?fromPayPal=1&CANCELURL=http://www.pnjone.com/order.php&CURRENCYCODE=CN&NOSHIPPING=1
Send with CURL method sucessfull
PayPal response:
TIMESTAMP -> 2010-10-15T02:00:53Z
CORRELATIONID -> 5974f18aed278
ACK -> Failure
VERSION -> 53.0
BUILD -> 1553277
L_ERRORCODE0 -> 10002
L_SHORTMESSAGE0 -> Security error
L_LONGMESSAGE0 -> Security header is not valid
L_SEVERITYCODE0 -> Error
PayPal returned error