java.lang.AssertionError: Could not make D:\vyvoj\refactoring\nb_all\nbbuild\usr2\build.properties; no masterfs?
	at org.netbeans.spi.project.support.ant.PropertyUtils$2.run(PropertyUtils.java:132)
	at org.openide.util.Mutex.writeAccess(Mutex.java:307)
	at org.netbeans.spi.project.support.ant.PropertyUtils.putGlobalProperties(PropertyUtils.java:123)
	at org.netbeans.modules.java.j2seplatform.libraries.J2SELibraryTypeProvider$1.run(J2SELibraryTypeProvider.java:86)
	at org.openide.util.Mutex.postRequest(Mutex.java:979)
	at org.openide.util.Mutex.postWriteRequest(Mutex.java:430)
	at org.netbeans.modules.java.j2seplatform.libraries.J2SELibraryTypeProvider.libraryCreated(J2SELibraryTypeProvider.java:79)
	at org.netbeans.modules.project.libraries.LibrariesStorage.loadFromStorage(LibrariesStorage.java:111)
	at org.netbeans.modules.project.libraries.LibrariesStorage.initStorage(LibrariesStorage.java:140)
	at org.netbeans.modules.project.libraries.LibrariesStorage.getLibraries(LibrariesStorage.java:245)
	at org.netbeans.modules.project.libraries.LibrariesModule.restored(LibrariesModule.java:37)
	at org.netbeans.core.modules.NbInstaller.loadCode(NbInstaller.java:322)
	at org.netbeans.core.modules.NbInstaller.load(NbInstaller.java:240)
	at org.netbeans.core.modules.ModuleManager.enable(ModuleManager.java:869)
	at org.netbeans.core.modules.ModuleList.installNew(ModuleList.java:350)
	at org.netbeans.core.modules.ModuleList.trigger(ModuleList.java:284)
	at org.netbeans.core.modules.ModuleSystem.restore(ModuleSystem.java:253)
	at org.netbeans.core.NonGui.run(NonGui.java:369)
	at org.netbeans.core.Main.run(Main.java:170)
	at org.netbeans.core.NbTopManager.getNbTopManager(NbTopManager.java:239)
	at org.netbeans.core.NbTopManager.get(NbTopManager.java:188)
	at org.netbeans.core.Main.start(Main.java:312)
	at org.netbeans.core.TopThreadGroup.run(TopThreadGroup.java:90)
[catch] at java.lang.Thread.run(Unknown Source)