netbeans IDE 5.5.1 RUN問題

Question

RUN時出錯，無論是什麼程序
簡單的程序程序：
public class NewClass {/** Creates a new instance of NewClass */
public NewClass() {
}
public static void main(String args[]){
System.out.println("asdasdasdasd");
}
}
RUN時出錯:
ERROR - Ant is misconfigured and cannot be run.
java.lang.NullPointerException
at org.apache.tools.ant.module.bridge.AntBridge.createCustomDefs(AntBridge.java:474)
at org.apache.tools.ant.module.bridge.AntBridge.createStuff(AntBridge.java:296)
at org.apache.tools.ant.module.bridge.AntBridge.getStuff(AntBridge.java:248)
at org.apache.tools.ant.module.bridge.AntBridge.getInterface(AntBridge.java:237)
at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:293)
at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:131)
而且我的系統不隻一次出現這個問題
（重裝系統）

Answer 1

卸載掉，重新安裝，安裝不了，出現下邊問題：
在安裝期間發生錯誤。
發生錯誤，產品安裝失敗。 請查看日誌檔 d:\netbeans-5.5.1dev\_uninst\install.log 以取得明細。
Error: NetBeans IDE 5.5.1 Development Version installer have encountered errors during installation. Check the install log below.  Choose Finish to exit the Wizard.
NetBeans IDE 5.5.1 Development Version installation location:
d:\netbeans-5.5.1dev
Installation log:
d:\netbeans-5.5.1dev\_uninst\install.log
install.log:(2007/6/8 下午 04:44:46), Install, org.netbeans.installer.PostInstallFixupAction, dbg, deleting D:\netbeans-5.5.1dev\nb5.5\config\productid
(2007/6/8 下午 04:44:46), Install, org.netbeans.installer.PostInstallFixupAction, dbg, deleting D:\netbeans-5.5.1dev\nb5.5\var\license_accepted
(2007/6/8 下午 04:44:46), Install, org.netbeans.installer.PostInstallFixupAction, dbg, Trying to delete: D:\netbeans-5.5.1dev\nb5.5\var
(2007/6/8 下午 04:44:46), Install, org.netbeans.installer.PostInstallFixupAction, dbg, uninstall Delete install dir on exit: D:\netbeans-5.5.1dev
(2007/6/8 下午 04:44:46), Install, com.installshield.wizard.platform.win32.Win32ProductServiceImpl, msg1, uninstalling Files (files)
(2007/6/8 下午 04:44:54), Install, org.netbeans.installer.PostInstallWizardAction, dbg, uid: 274c5407c4fa26908310cb5c1c5510de
(2007/6/8 下午 04:44:54), Install, org.netbeans.installer.PostInstallWizardAction, dbg, Key -> Software\Microsoft\Windows\CurrentVersion\Uninstall
(2007/6/8 下午 04:44:54), Install, org.netbeans.installer.PostInstallWizardAction, dbg, nbInstallDir: D:\netbeans-5.5.1dev
(2007/6/8 下午 04:44:55), Install, org.netbeans.installer.NbSummaryPanel, dbg, queryEnter exitCode: -400

Answer 2

http://forum.java.sun.com/thread.jspa?threadID=610775&messageID=4192358一样的问题，貌似是三方jar放置的问题