React-hook-form: Just tested out your demo code and got this

Created on 27 Dec 2019 · 3Comments · Source: react-hook-form/react-hook-form

/src/components/competitions/TheVaultform.js
Line 5: React Hook "useForm" is called in function "contactform" which is neither a React function component or a custom React Hook function react-hooks/rules-of-hooks

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unsure why the following code is causing an error like this. and yes I did install your plugin.

import React from 'react';
import { useForm } from 'react-hook-form';

export default function contactform() {
  const { register, handleSubmit, errors } = useForm();
  const onSubmit = data => console.log(data);
  console.log(errors);

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <input type="text" placeholder="First name" name="First name" ref={register({required: true, maxLength: 80})} />
      <input type="text" placeholder="Last name" name="Last name" ref={register({required: true, maxLength: 100})} />
      <input type="text" placeholder="Email" name="Email" ref={register({required: true, pattern: /^\S+@\S+$/i})} />
      <input type="tel" placeholder="Mobile number" name="Mobile number" ref={register({required: true, minLength: 6, maxLength: 12})} />
      <select name="Title" ref={register({ required: true })}>
        <option value="Mr">Mr</option>
        <option value="Mrs">Mrs</option>
        <option value="Miss">Miss</option>
        <option value="Dr">Dr</option>
      </select>

      <input name="Developer" type="radio" value="Yes" ref={register({ required: true })}/>
      <input name="Developer" type="radio" value="No" ref={register({ required: true })}/>

      <input type="submit" />
    </form>
  );
}

not valid

Source

redimongo

Most helpful comment

Try changing the first letter of the function's name to uppercase
from: contactform to Contactform
and make sure that on App.js you import the component with the same name (first letter uppercase) and the render function has <Contactform /> on it.