compilation debug= true targetframework= 4.0 / configuration error

There are many reason caused configuration error was caught.

But I got the stupid one.

I checked the Web.config file and found that I configured two duplicate configuration item as below:

 <system.web>
    <compilation debug="true" targetFramework="4.0" />
  </system.web>

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原文地址：https://www.cnblogs.com/vincentDr/p/3063051.html