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If I have not saved form and press build project button then IDE not saves it and build after but gives: java.lang.AssertionError at org.openide.text.CloneableEditorSupport.getOpenedPanes(CloneableEditorSupport.java:836) at org.netbeans.modules.form.JavaCodeGenerator$FormListener.isJavaEditorDisplayed(JavaCodeGenerator.java:3447) at org.netbeans.modules.form.JavaCodeGenerator$FormListener.formChanged(JavaCodeGenerator.java:3433) at org.netbeans.modules.form.FormModel.fireEvents(FormModel.java:960) at org.netbeans.modules.form.FormModel.sendEventImmediately(FormModel.java:988) at org.netbeans.modules.form.FormModel.fireFormToBeSaved(FormModel.java:675) at org.netbeans.modules.form.FormEditor.saveFormData(FormEditor.java:302) at org.netbeans.modules.form.FormEditorSupport.saveDocument(FormEditorSupport.java:274) at org.netbeans.modules.form.FormEditorSupport$8.save(FormEditorSupport.java:1238) at org.netbeans.core.NbTopManager.saveAll(NbTopManager.java:271) at org.netbeans.core.NbTopManager.access$300(NbTopManager.java:69) at org.netbeans.core.NbTopManager$NbLifecycleManager.saveAll(NbTopManager.java:428) at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:356) [catch] at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:129) If I implicitly save document then it builds project correctly.
A known problem, see issue 91715. *** This issue has been marked as a duplicate of 91715 ***