设置了<customErrors mode="Off"/>还提示<customErrors mode="Off"/>或者有以下提示

Server Error in '/xgbNew' Application.
--------------------------------------------------------------------------------

Configuration Error
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: An error occurred loading a configuration file: Failed to start monitoring changes to 'D:\webroot\wwwroot2' because access is denied.

Source Error:

[No relevant source lines]

Source File: D:\webroot\wwwroot2\web.config Line: 0

--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42
有如下解决办法：
1.framework版本问题。
2.主文件夹的权限问题，---everyone
其他原因搜集中...