Opening ERD in Data Modeler

I am using Data Modeler 2, build 570.
A colleague gave me an ERD he had created with this tool, as an xml.
I copied this ERD and made some changes and saved. But the next day, when I tried to open this modified version, nothing came up. I briefly saw the thermometer bar that displays when an ERD is being loased, but after that nothing appeared in the "Logical" tab. Does anybody know why? Thanks.

OK. Here's the brand new log file after simply trying to open the ERD. I hope it's not too long.
2010-10-20 11:03:31,486 [main] INFO ApplicationView - Oracle SQL Developer Data Modeler Version: 2.0.0 Build: 570
2010-10-20 11:03:34,377 [main] WARN AbstractXMLReader - There is no file with default domains (path: domains name: defaultdomains)
2010-10-20 11:03:56,470 [Thread-3] ERROR FileManager - getDataInputStream: Can not read data
java.io.FileNotFoundException: H:\NE-FIMS\nefims_mqrs_101810Changes\rdbms\nefims_mqrs_101810Changes_RDBMSSites.xml (The system cannot find the path specified)
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(FileInputStream.java:106)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStream(Unknown Source)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStreamWithoutExtension(Unknown Source)
     at oracle.dbtools.crest.model.persistence.XMLPersistenceManager.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.recreateObject(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.handleRecreateObject(Unknown Source)
     at oracle.dbtools.crest.model.persistence.XMLPersistenceManager.read(Unknown Source)
     at oracle.dbtools.crest.model.design.Design.loadRDBMSSites(Unknown Source)
     at oracle.dbtools.crest.model.design.Design.openDesign(Unknown Source)
     at oracle.dbtools.crest.swingui.ControllerApplication$OpenDesign$2.run(Unknown Source)
2010-10-20 11:03:56,470 [Thread-3] ERROR AbstractXMLReader - Data inputstream is null (path: nefims_mqrs_101810Changes/rdbms name: nefims_mqrs_101810Changes_RDBMSSites)
2010-10-20 11:03:56,470 [Thread-3] ERROR FileManager - getDataInputStream: Can not read data
java.io.FileNotFoundException: H:\NE-FIMS\nefims_mqrs_101810Changes\businessinfo\Business Information.xml (The system cannot find the path specified)
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(FileInputStream.java:106)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStream(Unknown Source)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStreamWithoutExtension(Unknown Source)
     at oracle.dbtools.crest.model.persistence.XMLPersistenceManager.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.recreateDesign(Unknown Source)
     at oracle.dbtools.crest.model.businessinfo.BusinessInfoDesign.load(Unknown Source)
     at oracle.dbtools.crest.model.design.Design.openDesign(Unknown Source)
     at oracle.dbtools.crest.swingui.ControllerApplication$OpenDesign$2.run(Unknown Source)
2010-10-20 11:03:56,470 [Thread-3] ERROR AbstractXMLReader - Data inputstream is null (path: nefims_mqrs_101810Changes/businessinfo name: Business Information)
2010-10-20 11:03:56,470 [Thread-3] ERROR FileManager - getDataInputStream: Can not read data
java.io.FileNotFoundException: H:\NE-FIMS\nefims_mqrs_101810Changes\datatypes\DataTypes.xml (The system cannot find the path specified)
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(FileInputStream.java:106)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStream(Unknown Source)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStreamWithoutExtension(Unknown Source)
     at oracle.dbtools.crest.model.persistence.XMLPersistenceManager.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.recreateDesign(Unknown Source)
     at oracle.dbtools.crest.model.design.datatypes.DataTypesDesign.load(Unknown Source)
     at oracle.dbtools.crest.model.design.Design.openDesign(Unknown Source)
     at oracle.dbtools.crest.swingui.ControllerApplication$OpenDesign$2.run(Unknown Source)
2010-10-20 11:03:56,470 [Thread-3] ERROR AbstractXMLReader - Data inputstream is null (path: nefims_mqrs_101810Changes/datatypes name: DataTypes)
2010-10-20 11:03:56,486 [Thread-3] ERROR FileManager - getDataInputStream: Can not read data
java.io.FileNotFoundException: H:\NE-FIMS\nefims_mqrs_101810Changes\logical\Logical.xml (The system cannot find the path specified)
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(FileInputStream.java:106)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStream(Unknown Source)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStreamWithoutExtension(Unknown Source)
     at oracle.dbtools.crest.model.persistence.XMLPersistenceManager.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.recreateDesign(Unknown Source)
     at oracle.dbtools.crest.model.design.DesignPart.load(Unknown Source)
     at oracle.dbtools.crest.model.design.Design.openDesign(Unknown Source)
     at oracle.dbtools.crest.swingui.ControllerApplication$OpenDesign$2.run(Unknown Source)
2010-10-20 11:03:56,486 [Thread-3] ERROR AbstractXMLReader - Data inputstream is null (path: nefims_mqrs_101810Changes/logical name: Logical)
2010-10-20 11:03:56,486 [Thread-3] ERROR FileManager - getDataInputStream: Can not read data
java.io.FileNotFoundException: H:\NE-FIMS\nefims_mqrs_101810Changes\rel\1.xml (The system cannot find the path specified)
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(FileInputStream.java:106)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStream(Unknown Source)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStreamWithoutExtension(Unknown Source)
     at oracle.dbtools.crest.model.persistence.XMLPersistenceManager.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.recreateDesign(Unknown Source)
     at oracle.dbtools.crest.model.design.relational.RelationalDesign.load(Unknown Source)
     at oracle.dbtools.crest.model.design.Design.openDesign(Unknown Source)
     at oracle.dbtools.crest.swingui.ControllerApplication$OpenDesign$2.run(Unknown Source)
2010-10-20 11:03:56,486 [Thread-3] ERROR AbstractXMLReader - Data inputstream is null (path: nefims_mqrs_101810Changes/rel name: 1)
2010-10-20 11:03:56,486 [Thread-3] ERROR FileManager - getDataInputStream: Can not read data
java.io.FileNotFoundException: H:\NE-FIMS\nefims_mqrs_101810Changes\mapping\ExtendedMap.xml (The system cannot find the path specified)
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(FileInputStream.java:106)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStream(Unknown Source)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStreamWithoutExtension(Unknown Source)
     at oracle.dbtools.crest.model.persistence.XMLPersistenceManager.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.recreateDesign(Unknown Source)
     at oracle.dbtools.crest.model.xtdmapping.ExtendedMap.load(Unknown Source)
     at oracle.dbtools.crest.model.design.Design.openDesign(Unknown Source)
     at oracle.dbtools.crest.swingui.ControllerApplication$OpenDesign$2.run(Unknown Source)
2010-10-20 11:03:56,486 [Thread-3] ERROR AbstractXMLReader - Data inputstream is null (path: nefims_mqrs_101810Changes/mapping name: ExtendedMap)
2010-10-20 11:03:56,486 [Thread-3] ERROR FileManager - getDataInputStream: Can not read data
java.io.FileNotFoundException: H:\NE-FIMS\nefims_mqrs_101810Changes\pm\CE1ED413-B0C7-EDAD-26DA-7BA1830304C2.xml (The system cannot find the path specified)
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(FileInputStream.java:106)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStream(Unknown Source)
     at oracle.dbtools.crest.model.persistence.FileManager.getDataInputStreamWithoutExtension(Unknown Source)
     at oracle.dbtools.crest.model.persistence.XMLPersistenceManager.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.getInputStreamFor(Unknown Source)
     at oracle.dbtools.crest.model.persistence.xml.AbstractXMLReader.recreateDesign(Unknown Source)
     at oracle.dbtools.crest.model.design.process.ProcessModel.load(Unknown Source)
     at oracle.dbtools.crest.model.design.Design.openDesign(Unknown Source)
     at oracle.dbtools.crest.swingui.ControllerApplication$OpenDesign$2.run(Unknown Source)
2010-10-20 11:03:56,486 [Thread-3] ERROR AbstractXMLReader - Data inputstream is null (path: nefims_mqrs_101810Changes/pm name: CE1ED413-B0C7-EDAD-26DA-7BA1830304C2)

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