OFTP接收文件报错：The file TEST.TXT is requesting unsigned receipt.

[Emma]

你好，客户通过OFTP发送文件反馈他们发送失败了并且报错：errorcode 99, Unspecified reason，同时我们在知行之桥的OFTP端口的接收页面看到报错：The file TEST.TXT is requesting unsigned receipt. But the RequireSignedReceiptRequest is set to true in the connector Default:OFTP，请问这个是什么原因导致的呢？