How to import database repository to di server repository?

Hi,

first, sorry for my bad english.

I want to import my database repository created with Pentaho 4.4 and migrate in Pentaho 6.0 in the Pentaho 7.0 DI Server.
I try with the import of PDI 7.0 but I received this error:

org.pentaho.di.core.exception.KettleException:
Unable to read shared objects from repository


Unable to get all files of type [database]
exception while getting children for folder with id "75268606-c134-4577-a189-a0d2f3ed06de"


Reference number: 913da910-9a36-43b7-8d17-72b68618277f




at org.pentaho.di.repository.pur.PurRepository.loadAndCacheSharedObjects(PurRepository.java:1640)
at org.pentaho.di.repository.pur.PurRepository.loadAndCacheSharedObjects(PurRepository.java:1648)
at org.pentaho.di.repository.pur.PurRepositoryImporter.populateSharedObjectsMap(PurRepositoryImporter.java:63)
at org.pentaho.di.repository.pur.PurRepositoryImporter.replaceSharedObjects(PurRepositoryImporter.java:95)
at org.pentaho.di.repository.RepositoryImporter.importTransformation(RepositoryImporter.java:726)
at org.pentaho.di.repository.RepositoryImporter.transformationElementRead(RepositoryImporter.java:877)
at org.pentaho.di.repository.RepositoryExportSaxParser.endElement(RepositoryExportSaxParser.java:95)
at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:328)
at org.pentaho.di.repository.RepositoryExportSaxParser.parse(RepositoryExportSaxParser.java:70)
at org.pentaho.di.repository.RepositoryImporter.importAll(RepositoryImporter.java:230)
at org.pentaho.di.ui.repository.dialog.RepositoryImportProgressDialog$3.run(RepositoryImportProgressDialog.java:194)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Can anyone help me?

Thanks,
Claudio