这是由于安装错误造成的。

It's due to the mistake of the installation.

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如果在后台执行安装，那么更难于诊断安装错误。

If you perform the installation in the background, any installation errors are more difficult to diagnose.

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这样可以防止因用户忘记输入必需的信息而导致安装错误。

This prevents users from forgetting to enter required information, which would cause installation errors. The UserInputPanel based on Listing 3 is shown in Figure 3

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