I have Nuxt app, and a very simple server handler for the contact form (using nodemailer). Locally everything is working fine, but on the server i get the next error:

{
    "url": "/api/contact",
    "statusCode": 500,
    "statusMessage": "",
    "message": "Class extends value #<Object> is not a constructor or null",
    "stack": ""
}

And this the handler:

export default defineEventHandler(async (event) => {
    try {
        const body = await readBody(event)
        const { error } = contactSchema.validate(body)

        if (error) {
            throw new Error(`Invalid request body: ${error.message}`)
        }
        const { name, email, tel, message } = body
        const config = useRuntimeConfig()
        const transporter = nodemailer.createTransport({
            host: config.SMTP_HOST,
            port: 587,
            secure: false,
            auth: {
                user: config.SMTP_USER,
                pass: config.SMTP_PASS,
            },
        })
    

        const mailOptions = {
            from: `Website form" <${config.SMTP_EMAIL}>`,
            to: config.SMTP_EMAIL,
            subject: `Webform - Name: ${name}`,
            html: `
        <p>Name: ${name}</p>
        <p>Phone: ${tel}</p>
        <p>Email: ${email}</p>
        <p>${message}</p>
      `,
        }

        // Send the email
        transporter.sendMail(mailOptions, function (error, info) {
            if (error) {
                console.log(`Error: ${error}`)
            } else {
                console.log('Email sent: ' + info.response)
            }
        })

        return { code: 200, message: 'Email sent successfully' }
    } catch (error) {
        console.error(error)
        return { code: 500, message: 'Failed to send email' }
    }
})

does somebody know what could be the cause of this?