Javascript 错误：架构中找不到未定义的构造函数

以下调用导致此错误：

Error: Constructor undefined not found in schema.

有什么问题？我正在使用MTProtol电报API

mtproto.call("messages.sendMedia", {
    media: [{
        _: "inputMediaUploadedDocument",
        file: "img.jpg",
        attributes: [{
            _: "documentAttributeImageSize",
            w: 300,
            h: 300
        }]
    }],
    message: `Upload! \nEste bot está em faze de testes!`,
    peer: {
        _: 'inputPeerChannel',
        channel_id: channel_id,
        access_hash: channel_access_hash
    }
})