Copy of check box course element doesn't create the check box on the database

2016-05-30 10:06:04,117 [ajp-nio2-8021-exec-12] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N1-E40 

https://lms.xyz.de/auth/RepositoryEntry/922419202/CourseNode/91078645823254 ^%^ Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36
**RedScreen**

<dispatchinfo>
	<componentinfo>
		<compname>ffo_main_assessment_per_box</compname>
		<compclass>org.olat.core.gui.components.form.flexible.impl.FormWrapperContainer</compclass>
		<extendedinfo>n/a</extendedinfo>
		<event>
			<class&gt;org.olat.core.gui.control.Event</class&gt;
			<command>validation ok</command>
			<tostring>com:validation ok,org.olat.core.gui.control.Event@d62b3f02</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.course.nodes.cl.ui.CheckboxAssessmentController</controllername>
		<controllername>org.olat.course.nodes.cl.ui.CheckListAssessmentController</controllername>
		<controllername>org.olat.course.nodes.cl.ui.CheckListRunForCoachController</controllername>
		<controllername>org.olat.course.run.RunMainController</controllername>
		<controllername>org.olat.course.run.CourseRuntimeController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
	</controllerinfo>
</dispatchinfo>

>>> stack of 1.cause::org.olat.core.logging.OLATRuntimeException: null
-> at org.olat.core.gui.exception.ExceptionWindowController.<init>(ExceptionWindowController.java:116)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:57)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:46)
   at org.olat.core.gui.components.Window.dispatchRequest(Window.java:536)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:234)
   at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:193)
   at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:298)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:216)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:289)
   at org.olat.core.servlets.OpenOLATServlet.doPost(OpenOLATServlet.java:232)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.course.nodes.cl.manager.CheckboxManagerImpl.loadCheck(CheckboxManagerImpl.java:349)
   at org.olat.course.nodes.cl.manager.CheckboxManagerImpl.check(CheckboxManagerImpl.java:309)
   at org.olat.course.nodes.cl.ui.CheckboxAssessmentController.formOK(CheckboxAssessmentController.java:378)
   at org.olat.core.gui.components.form.flexible.impl.FormBasicController.event(FormBasicController.java:367)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:202)
   at org.olat.core.gui.components.AbstractComponent$1.run(AbstractComponent.java:240)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.components.AbstractComponent.fireEvent(AbstractComponent.java:238)
   at org.olat.core.gui.components.form.flexible.impl.FormWrapperContainer.fireValidation(FormWrapperContainer.java:122)
   at org.olat.core.gui.components.form.flexible.impl.Form.submit(Form.java:465)
   at org.olat.core.gui.components.form.flexible.impl.Form.submit(Form.java:437)