Unity Ads SDK fail to initialize due to internal error

Unity Ads 3.4.6 and Unity Ads 3.4.0 has the same problem.

+[USRVApiSdk WebViewExposed_logError:callback:] (line:57) :: Initialization error: Unity Ads SDK fail to initialize due to internal error

 

Hi,
1.My devices is iphoneX
2.I had try 3.4.6 and 3.4.0, both have this issue
3.full logs:
I/UnityAds: +[UnityServices initialize:delegate:testMode:usePerPlacementLoad:] (line:48) :: Initializing Unity Ads 3.4.0 (3400) with game id 3xxxxx(--My Game id, I filled in the correct game ID) in test mode
I/UnityAds: -[USRVInitializeStateConfig execute] (line:167) :: Unity Ads init: load configuration from https://config.unityads.unitychina.cn/webview/3.4.0/release/config.json
I/UnityAds: -[USRVInitializeStateLoadCache execute] (line:205) :: Unity Ads init: webapp loaded from local cache
E/UnityAds: +[USRVApiSdk WebViewExposed_initError:code:callback:] (line:42) :: Web application failed to load with error : Unity Ads SDK fail to initialize due to internal error
E/UnityAds: +[USRVApiSdk WebViewExposed_logError:callback:] (line:57) :: Initialization error: Unity Ads SDK fail to initialize due to internal error

4.My ads code implementation:

- (void)viewDidLoad {
[super viewDidLoad];
[UnityAds initialize : @"3xxxxxx" delegate : self testMode : true];
}

 

hello~?

 

I am getting the same error. Don't know how to proceed.

 

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