意外「<」錯誤後，同時使用郵差和軌道

要填充我的JSON響應如下：意外「<」錯誤後，同時使用郵差和軌道

{ 
    "vendor": 
    { 
    "name": "Mozelle Luettgen MD", 
    "email": "[email protected]", 
    "phone_no": "9999997660", 
    "addressline1": "Kulas Stravenue", 
    "addressline2": "64636 Lynch Springs", 
    "landmark": "Apt. 142", 
    "city": "South Hannaview", 
    "state": "North Dakota", 
    "country": "Palau", 
    "pincode": "53912-6122", 
    "latitude": 50.8247548421224, 
    "longitude": -81.8429583068792, 
    "status": true 
    } 
}

我給創建廠商控制器代碼是

def create 
    @vendor = Vendor.new(vendor_params) 
    respond_to do |format| 
    if @vendor.save 
     format.html { redirect_to @vendor, notice: 'Vendor was       
     successfully created.' } 
     format.json { render :show, status: :created, location: @vendor, 
     :msg => { :status => "ok" , :result => @vendor.json, :message => 
     "Succesfully Created" } 
     } 
    else 
    format.html { render :new } 
    format.json { render json: @vendor.errors, status: 
    :unprocessable_entity, 
    :msg => 
    { :status => "Error", :message => "Unprocessable Entity" } 
    } 
    end 
    end 
end 


    def vendor_params 
    params.require(:vendor).permit(:name, :email, :phone_no, 
    :addressline1, :addressline2, :landmark, 
    :city, :state, :country, :pincode, :latitude, :longitude, :status, 
    {products_attributes: [:id, :product_name, :price]}, 
    {vendor_products_attributes: [:id, :vendor_product_id, :vendor_id,    
    :product_id, :copies, :_destroy]}) 
end

當運行此鏈接http://localhost:3000/vendors/create_vendor與帖子，狀態顯示200確定，但是當我尋找JSON響應，對於創建的供應商，它會拋出意想不到的'<'錯誤。我做錯了什麼。可以請某人詳細說明