java.lang.IllegalArgumentException: Unknown type of object facadeMock

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java.lang.IllegalArgumentException: Unknown type of object facadeMock
at org.apache.wicket.MarkupContainer.getId(MarkupContainer.java:1068)
at org.apache.wicket.MarkupContainer.children_indexOf(MarkupContainer.java:1130)
at org.apache.wicket.MarkupContainer.put(MarkupContainer.java:1318)
at org.apache.wicket.MarkupContainer.add(MarkupContainer.java:175)
at nl.app.Page.onInitialize(Page.java:53)
at org.apache.wicket.Component.fireInitialize(Component.java:877)
at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:961)
at org.apache.wicket.Page.isPageStateless(Page.java:463)
at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:244)
at org.apache.wicket.util.tester.BaseWicketTester$LastPageRecordingPageRendererProvider$1.respond(BaseWicketTester.java:2755)
at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:175)
at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:261)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:218)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289)
at org.apache.wicket.util.tester.BaseWicketTester.processRequest(BaseWicketTester.java:712)
at org.apache.wicket.util.tester.BaseWicketTester.processRequest(BaseWicketTester.java:651)
at org.apache.wicket.util.tester.BaseWicketTester.startPage(BaseWicketTester.java:876)
at nl.app.Page.testOverzicht(PageTest.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)

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