这个报错要怎么解决啊？

[sjnrain]

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: Child nodes not allowed.

Source Error:


Line 89: <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4"
Line 90: type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
Line 91: <providerOption name="CompilerVersion" value="v3.5"/>
Line 92: <providerOption name="WarnAsError" value="false"/>
Line 93: </compiler>

[sxy445566]

配置错误

说明：一个错误的过程中发生的配置处理此请求提供服务所需的文件。请检查下列特定错误详细信息并适当地修改配置文件。



分析器错误信息：不允许有子节点。


恩，怎么解决我也不太清楚。