错误提示：

google/protobuf/empty.proto: File not found.
user.proto:2:1: Import "google/protobuf/empty.proto" was not found or had errors.
user.proto:10:44: "google.protobuf.Empty" is not defined.

执行protoc --go_out=. --go-grpc_out=. user.proto 报错。
但是在 user.proto 中可以正常跳转到 empty.proto。

在python中执行python -m grpc_tools.protoc --python_out=. --grpc_python_out=. -I. user.proto 编译正常。

请问是什么原因
附上user.proto：

syntax = "proto3";
import "google/protobuf/empty.proto";
option go_package = ".;proto";

service User {
  rpc GetUserList(PageInfo) returns (UserListResponse); //用户列表
  rpc GetUserByMobile(MobileRequest) returns (UserInfoResponse); //用户信息
  rpc GetUserById(IdRequest) returns (UserInfoResponse); //用户信息
  rpc CreateUser(CreateUserInfo) returns (UserInfoResponse); //创建用户
  rpc UpdateUser(UpdateUserInfo) returns  (google.protobuf.Empty); //更新用户
}

message PageInfo {
  uint32 pn = 1;
  uint32 pSize = 2;
}


message MobileRequest{
  string mobile = 1;
}

message IdRequest{
  int32 id = 1;
}


message CreateUserInfo{
  string nickname = 1;
  string password = 2;
  string mobile = 3;
}

message UpdateUserInfo{
  int32 id =1;
  string nickname = 2;
  string gender = 3;
  uint64 birthday = 4;
}

message UserInfoResponse{
  int32 id = 1;
  string password = 2;
  string mobile = 3;
  string nickname = 4;
  uint64 birthday = 5;
  string gender = 6;
  int32 role = 7;
  string address = 8;
}

message UserListResponse {
  int32 total = 1;
  repeated UserInfoResponse data = 2;
}