java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.openxava.actions.BaseAction.addError(BaseAction.java:57)
at org.openxava.recetas.actions.AlPulsarGenerarInformeEntreFechas.execute(AlPulsarGenerarInformeEntreFechas.java:29)
at org.openxava.controller.ModuleManager.executeAction(ModuleManager.java:444)
at org.openxava.controller.ModuleManager.executeAction(ModuleManager.java:363)

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