Signup Failed with unknown error after deployed on Vercel

[rielcfb]

Please add as much information as possible to help us reproduce the issue. Hello, it is nice project and interesting, so I tried to test it and deploy on Vercel followed the steps. But, after it deployed succeed I want to signup the first user, it is failed with the request response unknown error. below is the request response on devtool:

{
    "type": "success",
    "status": 200,
    "data": "[{\"success\":1,\"error\":2},false,\"Unknown error\"]"
}