问题：
重装系统后打开工程，编译时发生错误，错误信息：
Error 5 An error occurred while signing: Failed to sign bin\Debug\app.publish\\setup.exe. SignTool Error: ISignedCode::Sign returned error: 0x80880253
The signer’s certificate is not valid for signing.
SignTool Error: An error occurred while attempting to sign: bin\Debug\app.publish\\setup.exe PublishBook
编程环境：vs2008 EN
通过GOOGLE查找发现国内兄弟遇到这类问题较少，在外国网站上找到了解决答案，放到这里以备各位兄弟查询
解决办法：
-Go to the property of the Project
-Select the Signing tab
-Click ‘create test certificate’ button
it will ask for new password 2 times and you have another 1 year extension!
原文https://www.cnblogs.com/forrestsun/articles/1148686.html
