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java.lang.IllegalArgumentException: SourceFolder must be a folder. org.netbeans.modules.java.j2seplatform.platformdefinition.J2SEPlatformImpl.setSourceFolders(J2SEPlatformImpl.java:193) org.netbeans.modules.java.j2seplatform.wizard.SrcDocLocation$Panel.storeSettings(SrcDocLocation.java:254) org.openide.WizardDescriptor.resetWizard(WizardDescriptor.java:832) org.openide.WizardDescriptor.setValue(WizardDescriptor.java:822) org.netbeans.core.windows.services.NbPresenter$ButtonListener.actionPerformed(NbPresenter.java:967) javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786) [...] I was editinf the default platform in project customizer, pointed it to JDK1.5 instalation, it autodetected everything and prefilled out the path to sources as ..../src.zip. But the wizard refused to finish with above mentioned exception. It went OK if I cleared the sources field.
Fixed.
Works OK now.