Migrating SAP NetWeaver WebDynpro 7.0 Applications to WebDynpro 7.3/7.4

Hi,
We are trying to migrate applications from SAP NetWeaver Portal 7.0 to 7.4. The applications were created using SAP NetWeaver WebDynpro Java 7.0 and we're trying to import the Development Components (DC) using SAP NetWeaver Development Studio CE 7.3. However we're encountering an error after rebuilding and repairing the applications
Error Details:
Generation of component ****Comp is terminated with an exception (com.sap.ide.mmservices.wd.general.NoWebDynproContentException: No Web Dynpro content found for project "***". If this project is a Development Component, check if "SapMetamodelWebdynproContent.zip" is present in the classpath.) [Error: com.sap.ide.webdynpro.generation.eclipse.GenerationEclipse Thread[Worker-29,5,main]]
The project was not built since its built path is incomplete. Cannot find the class for com.sap.mw.jco.JCO$Client.
The type com.sap.mw.jco.JCO$Client cannot be resolved. It is indirectly referenced from required .class files
Any ideas regarding the errors?
thank you.

Hi,
thank you all for your replies.
there are no longer errors anymore before deployment. However, once we deploy we encounter a build error.
here are the details:
!ENTRY org.eclipse.ui 4 4 2014-06-18 11:13:00.188
!MESSAGE java.lang.NullPointerException
!STACK 0
java.lang.NullPointerException
at org.eclipse.ui.internal.decorators.LightweightDecoratorManager$LightweightRunnable.run(LightweightDecoratorManager.java:81)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.ui.internal.decorators.LightweightDecoratorManager.decorate(LightweightDecoratorManager.java:365)
at org.eclipse.ui.internal.decorators.LightweightDecoratorManager.getDecorations(LightweightDecoratorManager.java:347)
at org.eclipse.ui.internal.decorators.LightweightDecoratorManager.getDecorationResult(LightweightDecoratorManager.java:378)
at com.sap.ide.tools.core.viewerfwk.ui.tree.wrapper.ProjectWrapper.getTreeNodeLabelText(ProjectWrapper.java:74)
at com.sap.ide.webdynpro.wdexplorer.tree.WDViewLabelProvider.getText(WDViewLabelProvider.java:98)
at com.sap.ide.tools.core.viewerfwk.ui.tree.CompoundLabelProvider.getText(CompoundLabelProvider.java:81)
at org.eclipse.jface.viewers.ViewerComparator.compare(ViewerComparator.java:135)
at com.sap.ide.tools.core.viewerfwk.ui.tree.CompoundViewerSorter.compare(CompoundViewerSorter.java:77)
at org.eclipse.jface.viewers.ViewerComparator$1.compare(ViewerComparator.java:187)
at java.util.Arrays.mergeSort(Arrays.java:1270)
at java.util.Arrays.mergeSort(Arrays.java:1281)
at java.util.Arrays.sort(Arrays.java:1210)
at org.eclipse.jface.viewers.ViewerComparator.sort(ViewerComparator.java:185)
at org.eclipse.jface.viewers.AbstractTreeViewer.getSortedChildren(AbstractTreeViewer.java:625)
at org.eclipse.jface.viewers.AbstractTreeViewer.updateChildren(AbstractTreeViewer.java:2578)
at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1863)
at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:716)
at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1838)
at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1794)
at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1780)
at org.eclipse.jface.viewers.StructuredViewer$7.run(StructuredViewer.java:1457)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1392)
at org.eclipse.jface.viewers.TreeViewer.preservingSelection(TreeViewer.java:402)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1353)
at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1455)
at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:537)
at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1414)
at com.sap.ide.dictionary.ddicexplorer.tree.DDICContentProvider$1.run(DDICContentProvider.java:709)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3885)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3506)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
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:368)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
Do you have any ideas?
thank you very much!

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