RPC Durable Object not working

export class Example extends DurableObject {
  constructor(ctx: DurableObjectState, env: Env) {
    super(ctx, env);
    // ...
  }

  async fetch(request: Request): Promise<Response> {
    // ...
  }

  async create(test: string) {
    return test + "1";
  }
}

const objectId = c.env.EXAMPLE.idFromName("test");
const example = c.env.EXAMPLE.get(objectId);
const response = await example.create("example");