使用代码点火器发送电子邮件时出错

我在Codeigniter中使用"电子邮件"库发送电子邮件时遇到问题。

这是错误：

A PHP Error was encountered
Severity: Warning
Message:  mail() expects parameter 1 to be string, array given
Filename: libraries/Email.php
Line Number: 1553

这是我的代码，im发送电子邮件请求的模型。

 $count = count($result);
    $config = Array(
        'protocol' => 'smtp',
        'smtp_host' => 'ssl://smtp.gmail.com',
        'smtp_port' => 465,
        'smtp_user' => $correo, // change it to yours
        'smtp_pass' => '', // change it to yours
        'mailtype' => 'html',
        'charset' => 'utf-8',
        'newline' => "'r'n",
        'wordwrap' => TRUE
    );
    $body = "¡Hola! <br><br>";
    $body .= "Este e-mail  es para avisarte que has recibido un nuevo m ensaje " . $contexto . $result2[0]->nombre . ".<br><br>";
    $body .= "Contenido: <strong>" . $mensaje . ".<strong><br>";
    if ($tipo == 2) {
        $body .= "Entra a la aplicación Para confirmar tu asistencia.";
    }
    $this->load->library('Email');
    $this->load->library('Email', $config);
    $this->email->set_mailtype("html");
    $this->email->from($correo);
    for ($i = 0; $i < $count; $i++) {
        foreach ($result[$i] as $item) {
            $this->email->to($item);
        }
    }
    $this->email->subject($asunto);
    $this->email->message($body);
    $this->email->send();
}
}

我不知道为什么要发送此错误。不感谢任何帮助。