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This bug was originally marked as duplicate of bug 190424, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.1 Beta (Build 201109252201) VM: Java HotSpot(TM) Client VM, 21.1-b02, Java(TM) SE Runtime Environment, 1.7.0_01-b08 OS: Windows Vista Stacktrace: java.lang.AssertionError at org.netbeans.spi.project.support.ant.AntProjectHelper.save(AntProjectHelper.java:603) at org.netbeans.spi.project.support.ant.AntProjectHelper.access$100(AntProjectHelper.java:110) at org.netbeans.spi.project.support.ant.AntProjectHelper$1.save(AntProjectHelper.java:148) at org.netbeans.modules.project.ant.AntBasedProjectFactorySingleton.saveProject(AntBasedProjectFactorySingleton.java:447) at org.netbeans.api.project.ProjectManager$6.run(ProjectManager.java:663) at org.netbeans.api.project.ProjectManager$6.run(ProjectManager.java:654)
Created attachment 122336 [details] stacktrace
Reported for 7.3.x or earlier, no new info since then -> closing as worksforme, please reopen in case you see it.