DjangoGraphQLJWT：tokenAuth突变返回“str对象没有属性解码”

目前我正在从文档页面运行 django-graphqljwt 的基本示例。https://django-graphql-jwt.domake.io/en/latest/quickstart.html

import graphene
import graphql_jwt


class Mutation(graphene.ObjectType):
    token_auth = graphql_jwt.ObtainJSONWebToken.Field()
    verify_token = graphql_jwt.Verify.Field()
    refresh_token = graphql_jwt.Refresh.Field()


schema = graphene.Schema(mutation=Mutation)

但是，如果我运行tokenAuth突变，它会在GraphiQL界面中抛出以下错误。请注意，如果我输入不正确的凭据，它会抛出一个“ Please enter valid credentials”而不是下面的。

{
  "errors": [
    {
      "message": "'str' object has no attribute 'decode'",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "tokenAuth"
      ]
    }
  ],
  "data": {
    "tokenAuth": null
  }
}

回答