I am trying to call workers ai using

import type { D1Database } from '@cloudflare/workers-types';
import { Hono } from 'hono';
import { ConversationChain } from 'langchain/chains';
import { CloudflareWorkersAI } from 'langchain/llms/cloudflare_workersai';
import { BufferMemory } from 'langchain/memory';
import { CloudflareD1MessageHistory } from 'langchain/stores/message/cloudflare_d1';

type Bindings = {
    DB: D1Database;
    CLOUDFLARE_API_TOKEN: string;
    CLOUDFLARE_ACCOUNT_ID: string;
};

const app = new Hono<{ Bindings: Bindings }>();

app.get('/', async (c) => {
    try {
        const input = c.req.query('input');
        console.log(input);

        if (!input) {
            return c.text('Please provide input query parameter', 400);
        }

        console.error(c.env);

        const memory = new BufferMemory({
            chatHistory: new CloudflareD1MessageHistory({
                tableName: 'stored_message',
                sessionId: 'example',
                database: c.env.DB,
            }),
        });

        const model = new CloudflareWorkersAI({
            // model: '@cf/mistral/mistral-7b-instruct-v0.1',
            streaming: false,
            cloudflareAccountId: c.env.CLOUDFLARE_ACCOUNT_ID,
            cloudflareApiToken: c.env.CLOUDFLARE_API_TOKEN,
        });
        const chain = new ConversationChain({ llm: model, memory });
        const res = await chain.call({ input });

        return c.text(res.response);
    } catch (e) {
        console.error(e);
        return c.text(e.message, 500);
    }
});

export default app;