初学，使用NetBeans遇到问题，求助
生成失败，能帮帮我吗？Creating output directories if needed...
Gathering info for AndroidApplication3...
Android SDK Tools Revision 19
Project Target: Android 4.0.3
API level: 15
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Resolving library dependencies:
No library dependencies.
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API<=15: Adding annotations.jar to the classpath.
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WARNING: No minSdkVersion value set. Application will install on all Android versions.
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Handling aidl files...
No AIDL files to compile.
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Handling RenderScript files...
No RenderScript files to compile.
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Handling Resources...
Found Deleted Target File
Generating resource IDs...
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Handling BuildConfig class...
Generating BuildConfig class.
Compiling 2 source files to C:\Users\u\Documents\NetBeansProjects\AndroidApplication3\bin\classes
Found Deleted Target File
Converting compiled files and external libraries into C:\Users\u\Documents\NetBeansProjects\AndroidApplication3\bin\classes.dex...
Crunching PNG Files in source dir: C:\Users\u\Documents\NetBeansProjects\AndroidApplication3\res
To destination dir: C:\Users\u\Documents\NetBeansProjects\AndroidApplication3\bin\res
Crunched 0 PNG files to update cache
Creating full resource package...
Current build type is different than previous build: forced apkbuilder run.
Creating AndroidApplication3-debug-unaligned.apk and signing it with a debug key...
D:\Android\android-sdk\tools\ant\build.xml:886: The following error occurred while executing this line:
D:\Android\android-sdk\tools\ant\build.xml:897: The following error occurred while executing this line:
D:\Android\android-sdk\tools\ant\build.xml:307:
com.android.sdklib.build.ApkCreationException: Debug Certificate expired on 12-4-6 下午7:44
at com.android.sdklib.build.ApkBuilder.getDebugKey(ApkBuilder.java:283)
at com.android.sdklib.build.ApkBuilder.<init>(ApkBuilder.java:390)
at com.android.ant.ApkBuilderTask.execute(ApkBuilderTask.java:334)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:68)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:398)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:68)
at com.android.ant.IfElseTask.execute(IfElseTask.java:124)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:68)
at com.android.ant.IfElseTask.execute(IfElseTask.java:124)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:68)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:398)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:392)
at org.apache.tools.ant.Target.performTasks(Target.java:413)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:285)
at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:539)
at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)
生成失败（总时间：4 秒）
--------------------编程问答-------------------- 看不懂啊啊啊啊 --------------------编程问答-------------------- 我刚解决了，方法跟这个一样
http://blog.csdn.net/linshangbo/article/details/6032221 --------------------编程问答-------------------- 为什么不用eclipse?
补充：移动开发 , Android
