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java.util.ConcurrentModificationException: 	at com.google.common.collect.HashBiMap$Itr.checkForConcurrentModification(HashBiMap.java:339)	at com.google.common.collect.HashBiMap$Itr.hasNext(HashBiMap.java:345)	at org.bimserver.merging.AbstractModelMerger.mergeScales(AbstractModelMerger.java:42)	at org.bimserver.merging.BasicModelMerger.merge(BasicModelMerger.java:19)