请求无效：不能使用多个字段来指定发件人

Question

我刚开始使用Paypal API来使用经典API进行P2P支付。

响应是以下错误：

  

无效请求：不能使用多个字段来指定a   发件人。

请求

  {requestEnvelope.errorLanguage=en_US&actionType=CREATE&cancelUrl=http%3A%2F%2Flocalhost%3A8080%2Fadaptivepaymentssample-2.4.103%2Findex.html¤cyCode=USD&receiverList.receiver(0).amount=2.0&receiverList.receiver(0).email=fsd.7-facilitator%40gmail.com&receiverList.receiver(0).primary=true&receiverList.receiver(0).paymentType=PERSONAL&senderEmail=sdasdsad-facilitator%40gmail.com&returnUrl=http%3A%2F%2Flocalhost%3A8080%2Fadaptivepaymentssample-2.4.103%2Findex.html&sender.useCredentials=true&}

回复

{responseEnvelope.timestamp=2013-10-09T11%3A01%3A37.639-07%3A00&responseEnvelope.ack=Failure&responseEnvelope.correlationId=32d5c266f19b1&responseEnvelope.build=7935900&error(0).errorId=580001&error(0).domain=PLATFORM&error(0).subdomain=Application&error(0).severity=Error&error(0).category=Application&error(0).message=Invalid+request%3A+More+than+one+field+cannot+be+used+to+specify+a+sender}

有谁知道可能导致此问题的原因？