这个怎么破？小白求助

[FormatException: 输入字符串的格式不正确。]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +7477367
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +119
   System.Convert.ToInt32(String value) +63
   Infragistics.WebUI.UltraWebListbar.UltraWebListbar.getRenderer() +237
   Infragistics.WebUI.UltraWebListbar.UltraWebListbar.get_IsAppStyling() +28
   Infragistics.WebUI.UltraWebListbar.UltraWebListbar.OnPreRender(EventArgs e) +73
   System.Web.UI.Control.PreRenderRecursiveInternal() +80
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842

  


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版本信息: Microsoft .NET Framework 版本:2.0.50727.3649; 版本:2.0.50727.3634