CakePHP 3 Password Reset fix

I have the following code to reset my password via a link through email (that works fine).

In my User Controller:

 public function resetpw($token = null) {
        $resetpw = $this->Users->findByToken('id');
        if ($this->request->is('post')) {
            $pw = $this->request->data['password'];
            $pwtable = TableRegistry::get('Users');
            $newpw = $pwtable->find($resetpw);
            $newpw->password = $pw;
            if ($pwtable->save($newpw)) {
                 $this->Flash->success(__('Your password has been successfully updated.'));
                return $this->redirect(['action' => 'login']);
        }
            else {
                $this->Flash->error(__('Your password could not be saved. Please, try again.'));
             }
        }
    }

The Reset Password CTP file:

Resetting your password?

<?= $this->Flash->render(); ?>
<?= $this->Form->create() ?>
    <fieldset>
        <legend><?= __('Please enter your new password.') ?></legend>
        <?= $this->Form->input('password', ['label' => 'New Password']) ?>
        <?= $this->Form->input('confirmpassword', ['type' => 'password', 'label' => 'Confirm New Password']) ?>
    </fieldset>
    <?= $this->Form->button(__('Update password')); ?>
<?= $this->Form->end() ?>

I also have the following rules regarding comparing the two passwords:

public function validatePasswords($validator)
{
    $validator->add('confirmpassword', 'no-misspelling', [
        'rule' => ['compareWith', 'password'],
        'message' => 'The passwords are not the same.',
    ]);
    return $validator;
}

After typing in two identical passwords for both the password & comfirmpassword fields, I get the following error:

Unknown finder method "SELECT Users.id AS Users__id, Users.username AS Users__username, Users.password AS Users__password, Users.email AS Users__email, Users.role AS Users__role, Users.token AS Users__token FROM users Users WHERE Users.token = :c0"

I'm not really sure what this means and how I go about resolving it.