本文解决了一个关于使用S60仿真器时出现的失败问题。通过替换项目下的nbproject文件夹中的project.properties文件，解决了由内置密钥库路径指向错误导致的仿真器启动失败。
问题：
使用J2ME的仿真器没有问题，使用S60仿真器出错。
但是新建一个项目，把所有的源代码拷贝过去，使用S60仿真器也没有问题。
提示如下：
Failed to launch the emulator failed.
Caught exception:
java.lang.RuntimeException:command failed with Symbian error code:-30472
解决：
项目下 nbproject 文件夹中 project.properties 文件的问题，替换掉即可。
project.properties 文件中有一项内容如下：
file.reference.builtin.ks=${netbeans.user}/config/j2me/builtin.ks
可能就是他引起的问题。
>
> Maybe easier solution - your WTK emulator points to the old location
> because you imported the setting from your old userdir. If you
> uninstalled/deleted the old userdir then it points to unexisting emulator.
> You can solve it by remove of the emulator platform from IDE (Tools | Java
> Platform Manager) and restart the IDE. It should install the bundled
> platform (WTK2.2) to your userdir and add it to Java Platform Manager
> again.
> Maybe easier solution - your WTK emulator points to the old location
> because you imported the setting from your old userdir. If you
> uninstalled/deleted the old userdir then it points to unexisting emulator.
> You can solve it by remove of the emulator platform from IDE (Tools | Java
> Platform Manager) and restart the IDE. It should install the bundled
> platform (WTK2.2) to your userdir and add it to Java Platform Manager
> again.
浪费了整整一天的时间！！
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