"Stringernal error" when requesting a Native Ad on Huawei Quick-App

I'm following this tutorial '[How can i integrate Huawei Ads into a HWAWEI HTML5 Quick Game] https://forums.developer.huawei.com/forumPortal/en/topic/0203442495128230052?fid=0101187876626530001' by a Huawei developer. But every time I request an ad, the onError callback fires with this result: {"errCode":1003,"errMsg":"Stringernal error."}. So far, I’ve tried running on a device, on emulator, tried to set the minPlatformVersion on manifest, and made sure I have the "service.ad" on the manifest. Also tried to create my own ad unit and put the ID on the code.

Does anyone know what this error means? Thanks

Make sure that the ad test ID you’re using is valid. Here’s the documentation for the 1003 error code link. You can also find more information in the official documentation link.