Unity3d C#中如何调用c++中返回值是结构体或者枚举的函数

[i75580]

我想实现Unity3d中调用C++的动态库
C++中的函数：

typedef enum {
    E_OK,                       /** Okay to go */
    E_NOT_READY,                /** RpsInitialize invoked before ? */
    E_BUSY,                     /** Not used */
    E_TIMEOUT,                  /** Not used */
    E_NO_RESOURCE,              /** resources requried not available */
	E_BAD_PARA,                 /** bad parameters */
    E_MULTI_SOURCE,             /** Not used */
    E_INVALID_VERSION           /** Not used */
} RpsError;

RpsAPI RpsError RpsInitialize(const char *conf);

Unity中的调用：

enum  RpsError{
    E_OK,
    E_NOT_READY,
    E_BUSY,
    E_TIMEOUT,
    E_NO_RESOURCE,
    E_BAD_PARA,
    E_MULTI_SOURCE,
    E_INVALID_VERSION
};

public class NewBehaviourScript : MonoBehaviour {
    [DllImport("RPSDataManager.dll")]
    unsafe ublic extern static RpsError RpsInitialize(string conf);

    	// Use this for initialization
	unsafe void Start () {
        RpsError err = RpsInitialize("RpsDataManager.API.txt");
        if (err != 0) {
            print("RpsInit failed!");
        }
	}
}

运行报错：
error CS0050:Inconsistent accessibility : return type 'RpsError' is less accessible than method 'NewBehaviourScript.RpsInitialize(string)'

请教一下我应该怎么处理呢？

[Saleayas]

public enum