Error: No response is returned from route handler ‘

I think i am handling the case if an exception is thrown just fine but still I keep getting an error Error: No response is returned from route handler ‘C:UsersayanOneDriveDesktopappswebappapifollowupsroute.ts’. Ensure you return a Response or a NextResponse in all branches of your handler.

I expected a response from this api after successful execution or just an exception rather than no response is returned error

/* eslint-disable @typescript-eslint/no-unsafe-member-access */
/* eslint-disable @typescript-eslint/no-unsafe-assignment */
import type { NextApiResponse } from "next";

 

export async function GET(res: NextApiResponse){

    try {

    const cohere_api_key = "";

    const followups = [
        {
            ques : "What other creative ways can ChatGPT be integrated into everyday objects?"
        },
        {
            ques: "How can AI be used to enhance education and learning experiences beyond exam assistance?"
        },
        {
            ques: "What are the potential ethical considerations of using AI-powered tools like this eraser during exams?"
        }

    ]

    console.log("###########Cohere is called");
    const promises = followups.map((item)=>(
        fetch('https://api.cohere.ai/v1/chat', {

        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'Authorization': `Bearer ${cohere_api_key}`, // Replace YOUR_API_KEY with your actual API key
        },
        body: JSON.stringify({
            message: `You are a smart blogger who write detailed blogs on a given topic, write a blog on topic: "${item.ques}"`,
            connectors: [{ id: 'web-search' }],
        }),
    }) 
    )

    )

    console.log("###########resolving promises")

    Promise.all(promises)
    .then((response)=>{
        console.log("all promises resolved", response);
        return Promise.all(response.map((res)=> res.json()));
    })
    .then((res)=>{
        console.log("/////response", res);
        const result = followups.map((followup , index) => ({
            question : followup.ques,
            content : res[index].text
        }))

        console.log("our final result set" ,result)

        return Response.json(result);

    })
    .catch((error) => {
        console.log("error",error)
        return res.status(500).json({ message: 'Internal server error' })
    })

} catch (error) {
    return res.status(500).json({ message: 'Internal server error' })
        
}
  }