[NullReferenceException: 未将对象引用设置到对象的实例。]
GetBuildTableByAjax.ProcessRequest(HttpContext context) +86
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +541
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +74
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +92
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