在pb.go文件中找不到方法RegisterGCDServiceServer，生成协议缓冲区的协议文件

golnag版本1.15.3 在pb.go文件中找不到方法RegisterGCDServiceServer

syntax = "proto3";

package pb;

message GCDRequest {
  uint64 a = 1;
  uint64 b = 2;
}

message GCDResponse {
  uint64 result = 1;
}

service GCDService {
  rpc Compute (GCDRequest) returns (GCDResponse) {}
}

梅因，加油

.
.
.
    s := grpc.NewServer()
    pb.RegisterGCDServiceServer(s, &server{})
    reflection.Register(s)
.
.
.