I solved it.
I copied by hand directly from the project directory directory content related to the contexts and connections
None of the functions of export provided allowed me, after importing use the project.

Goodmornig,

I apologiase for this request but i do not know how i can resolve my problem
I need to pass project from 5.0.1 to 5.1.
Normaly i export project in 5.0.1 and after i import into 5.1 and all run very well.
But now i obtain this situation
i export
i import
i open project in 5.1 and i see all my sun jobs
i open one of my sub job and i obtain this error:

java.lang.NullPointerException
    at org.talend.core.model.context.ContextUtils.getContextTypeByName(Unknown Source)
    at org.talend.core.model.context.ContextUtils.getContextTypeByName(Unknown Source)
    at org.talend.designer.core.ui.editor.process.ProcessUpdateManager.checkContext(Unknown Source)
    at org.talend.designer.core.ui.editor.process.ProcessUpdateManager.getUpdatesNeeded(Unknown Source)
    at org.talend.designer.core.ui.editor.process.ProcessUpdateManager.getUpdatesNeeded(Unknown Source)
    at org.talend.core.model.update.AbstractUpdateManager.checkAllModification(Unknown Source)
    at org.talend.core.model.update.AbstractUpdateManager.updateAll(Unknown Source)
    at org.talend.designer.core.ui.editor.process.Process.setEditor(Unknown Source)
    at org.talend.designer.core.ui.AbstractMultiPageTalendEditor.createPage1(Unknown Source)
    at org.talend.designer.core.ui.AbstractMultiPageTalendEditor.createPages(Unknown Source)
    at org.talend.designer.core.ui.MultiPageTalendEditor.createPages(Unknown Source)
    at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:348)
    at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:670)
    at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465)
    at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
    at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:289)
    at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2863)
    at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2768)
    at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2760)
    at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2711)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2707)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2691)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2682)
    at org.talend.designer.core.ui.action.EditProcess.doRun(Unknown Source)
    at org.talend.repository.ui.actions.AContextualAction$2.run(Unknown Source)
    at org.talend.repository.RepositoryWorkUnit.executeRun(Unknown Source)
    at org.talend.core.repository.model.AbstractRepositoryFactory.executeRepositoryWorkUnit(Unknown Source)
    at org.talend.repository.localprovider.model.LocalRepositoryFactory.executeRepositoryWorkUnit(Unknown Source)
    at org.talend.core.repository.model.ProxyRepositoryFactory.executeRepositoryWorkUnit(Unknown Source)
    at org.talend.repository.ui.actions.AContextualAction.run(Unknown Source)
    at org.talend.repository.viewer.action.RepoDoubleClickAction.run(Unknown Source)
    at org.eclipse.ui.actions.RetargetAction.run(RetargetAction.java:221)
    at org.eclipse.ui.navigator.CommonNavigatorManager$3.open(CommonNavigatorManager.java:185)
    at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48)
    at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:845)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
    at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
    at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:843)
    at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1131)
    at org.eclipse.ui.navigator.CommonViewer.handleOpen(CommonViewer.java:462)
    at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1235)
    at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:264)
    at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:258)
    at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:298)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.talend.rcp.intro.Application.start(Unknown Source)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1407)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1383)




in all my job there are on normaly component nothing dowload from exchange.

You can help me i do not understand where i create error.