获取验证码时出错了

vito

错误信息
-----------------------------------------------------
System.NullReferenceException: 未将对象引用设置到对象的实例。
   在 ..
(Image ,  ) 位置 #fb:行号 43
   在 ...
(Object , EventArgs ) 位置 #gc:行号 546
   在 ..() 位置 #hc:行号 611
   在 ..(Object ) 位置 #hc:行号 316


环境信息
-----------------------------------------------------
操作系统版本：Microsoft Windows NT 6.2.9200.0
程序运行目录：E:\Software\1常用软件\12306订票助手.NET


模块信息
-----------------------------------------------------
[001]. mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll
[002]. 12306订票助手, Version=2.0.4.688, Culture=neutral, PublicKeyToken=063375134da4cdc3 , E:\Software\1常用软件\12306订票助手.NET\12306订票助手.exe
[003]. System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms\v4.0_4.0.0.0__b77a5c561934e089\System.Windows.Forms.dll
[004]. System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Drawing\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll
[005]. System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll
[006]. System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll
[007]. System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll
[008]. System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll
[009]. Newtonsoft.Json, Version=4.5.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed , E:\Software\1常用软件\12306订票助手.NET\Newtonsoft.Json.dll
[010]. System.ComponentModel.DataAnnotations, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.ComponentModel.DataAnnotations\v4.0_4.0.0.0__31bf3856ad364e35\System.ComponentModel.DataAnnotations.dll
[011]. System.Runtime.Serialization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Runtime.Serialization\v4.0_4.0.0.0__b77a5c561934e089\System.Runtime.Serialization.dll
[012]. System.Xml.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Xml.Linq\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.Linq.dll
[013]. System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\WINDOWS\Microsoft.Net\assembly\GAC_32\System.Data\v4.0_4.0.0.0__b77a5c561934e089\System.Data.dll
[014]. BetterListViewExpress, Version=3.8.2.0, Culture=neutral, PublicKeyToken=e6c91a3add447be2 , E:\Software\1常用软件\12306订票助手.NET\BetterListViewExpress.dll
[015]. mscorlib.resources, Version=4.0.0.0, Culture=zh-Hans, PublicKeyToken=b77a5c561934e089 , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\mscorlib.resources\v4.0_4.0.0.0_zh-Hans_b77a5c561934e089\mscorlib.resources.dll
[016]. SimpleUpdater, Version=2.3.4.5, Culture=neutral, PublicKeyToken=8bf54bd6729f490c , E:\Software\1常用软件\12306订票助手.NET\SimpleUpdater.dll
[017]. Accessibility, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\Accessibility\v4.0_4.0.0.0__b03f5f7f11d50a3a\Accessibility.dll
[018]. System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a , C:\WINDOWS\Microsoft.Net\assembly\GAC_32\System.Web\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Web.dll
[019]. Microsoft.GeneratedCode, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null ,  不可用信息 (动态程序集)
[020]. ?, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null ,  不可用信息 (动态程序集)
[021]. System.Windows.Forms.resources, Version=4.0.0.0, Culture=zh-Hans, PublicKeyToken=b77a5c561934e089 , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms.resources\v4.0_4.0.0.0_zh-Hans_b77a5c561934e089\System.Windows.Forms.resources.dll
[022]. System.Drawing.resources, Version=4.0.0.0, Culture=zh-Hans, PublicKeyToken=b03f5f7f11d50a3a , C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Drawing.resources\v4.0_4.0.0.0_zh-Hans_b03f5f7f11d50a3a\System.Drawing.resources.dll