Osmosis - merge issue (Pipeline entities are not sorted or contain multiple versions)

OsmosisRuntimeException: Pipeline entities are not sorted or contain multiple versions of a single entity, previous entity type=Node, id=191805, version=5 current entity type=Node, id=191805, version=6.

Im having trouble with Osmosis when I try to apply a change set to a OSM file. I tried the following:

1. Extract a City data as OSM file from Planet OSM (using bounding poly file)
2. Sort the generated OSM
3. Get the immediate next change set file (OSC file) from Planet OSM website
4. Sort the Change set file
5. Run the osmosis apply-change command like below: $>osmosis --rxc d:\change_set_15Apr_sorted.osc --rx d:\myCity_sorted.osm --ac --wx d:\myCity_merged.osm

Osmosis throws the following exception: org.openstreetmap.osmosis.core.OsmosisRuntimeException: Pipeline entities are not sorted or contain multiple versions of a single entity, previous entity type=Node, id=191805, version=5 current entity type=Node, id=191805, version=6. at org.openstreetmap.osmosis.core.sort.v0_6.SortedDeltaChangePipeValidator.process(SortedDeltaChangePipeValidato r.java:49) at org.openstreetmap.osmosis.xml.v0_6.impl.ChangeSourceElementProcessor$ChangeSinkAdapter.process(ChangeSourceEl ementProcessor.java:134) at org.openstreetmap.osmosis.xml.v0_6.impl.NodeElementProcessor.end(NodeElementProcessor.java:118) at org.openstreetmap.osmosis.xml.v0_6.impl.OsmChangeHandler.endElement(OsmChangeHandler.java:94) at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source) at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)

How do I eliminate the duplicated nodes?

Appreciate your help.

Thank you Kris