java.lang.IllegalArgumentException: Type FXML03.jpa.exceptions.PreexistingEntityException cannot be found
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerUtil$TreeMakerUtils.createType(JpaControllerUtil.java:1019)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerUtil$TreeMakerUtils.createMethod(JpaControllerUtil.java:947)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerUtil$TreeMakerUtils.addMethod(JpaControllerUtil.java:899)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerGenerator$3.run(JpaControllerGenerator.java:713)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerGenerator$3.run(JpaControllerGenerator.java:248)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:649)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:639)
   at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:493)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:598)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:155)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:139)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:206)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:203)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:203)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:443)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:414)
   at org.netbeans.api.java.source.JavaSource.runModificationTask(JavaSource.java:660)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerGenerator.generateJpaController(JpaControllerGenerator.java:248)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerGenerator.generateJpaController(JpaControllerGenerator.java:159)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerIterator.generateJpaControllers(JpaControllerIterator.java:286)
   at org.netbeans.modules.j2ee.persistence.wizard.jpacontroller.JpaControllerIterator$1.run(JpaControllerIterator.java:133)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)