Error: Json was already defined and imported as a type, check the docs for extending types.

[GreenOn]

Hi, I am trying to add Json and DateTime scalar types in the type definitions, but I am getting an error [ERROR] 16:40:30 Error: Json was already defined and imported as a type, check the docs for extending types.
Here's how I am adding the Json and DateTime...

import { objectType, arg, intArg, stringArg, inputObjectType, enumType } from 'nexus';
import { GraphQLScalarType } from 'graphql';
import { JSONResolver, DateTimeResolver } from 'graphql-scalars';
import { asNexusMethod } from 'nexus';

export const Json = asNexusMethod(
    new GraphQLScalarType({
        ...JSONResolver,
        // Override the default 'JsonObject' name with one that matches what Nexus Prisma expects.
        name: 'Json',
    }),
    'json',
);

export const DateTime = asNexusMethod(new GraphQLScalarType(DateTimeResolver), 'dateTime');


export const Asn = objectType({
    name: "Asn",
    definition(t) {
        t.nonNull.id("id")
        t.nonNull.string("asnID")
        t.nonNull.string("description")
        t.string("comment")
        t.field("language", { type: Language })
        t.field("data", { type: Json })
        t.nonNull.field("createdAt", { type: DateTime })
        t.nonNull.field("updatedAt", { type: DateTime })
    }
})