RTC SVN Import Fails Due to Missing Encoding

I am attempting to import an SVN dump file into Rational Team Concert using the RTC process described here:

I get an error on a particular commit that fails the import and results in a stack dump like this:

I've tried changing the encoding on the import in many ways. I've also tried importing up to 1 changeset before the failing one and then trying to import the failing one with multiple encodings, nothing works. If I strip out this changeset and skip it the import will fail a few hundred commits later. Looking at the commit that fails, nothing special is done, only editing a dozen lines in a few source code files in the baseline. Any thoughts?

com.ibm.team.repository.common.TeamRepositoryException: An internal error occurred importing change set 'Revision 10691: (5/13/14 3:42 PM) '

                at com.ibm.team.scm.client.importz.internal.ChangeSetArchiveImporter.importChangeSetArchive(ChangeSetArchiveImporter.java:357)

                at com.ibm.team.scm.client.importz.internal.ImportArchiveOperation.doImport(ImportArchiveOperation.java:97)

                at com.ibm.team.scm.client.importz.internal.ImportArchiveOperation.run(ImportArchiveOperation.java:68)

                at com.ibm.team.scm.client.importz.internal.ImportArchiveOperation.performImport(ImportArchiveOperation.java:153)

                at com.ibm.team.scm.client.importz.internal.ui.ImportOperation.importIntoWorkspace(ImportOperation.java:186)

                at com.ibm.team.scm.client.importz.svn.internal.ui.SVNDumpFileImportOperation.importIntoWorkspace(SVNDumpFileImportOperation.java:135)

                at com.ibm.team.scm.client.importz.internal.ui.ImportOperation.repositoryRun(ImportOperation.java:123)

                at com.ibm.team.repository.rcp.ui.operations.RepositoryOperation.run(RepositoryOperation.java:43)

                at com.ibm.team.repository.rcp.ui.operations.JobRunner.run(JobRunner.java:240)

                at com.ibm.team.repository.rcp.ui.operations.JobRunner$1.run(JobRunner.java:63)

                at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

Caused by: java.lang.IllegalArgumentException: encoding must be supplied

                at com.ibm.team.filesystem.common.util.LineDelimiterUtil.getNonVerifyingLineDelimiterConverter(LineDelimiterUtil.java:41)

                at com.ibm.team.scm.client.importz.internal.ChangeSetArchiveImporter$4.getInputStream(ChangeSetArchiveImporter.java:1048)

                at com.ibm.team.scm.client.content.BasicVersionedContentManager.storeContent(BasicVersionedContentManager.java:303)

                at com.ibm.team.filesystem.client.internal.content.FileContentManager.storeContent(FileContentManager.java:306)

                at com.ibm.team.scm.client.importz.internal.ChangeSetArchiveImporter.setContents(ChangeSetArchiveImporter.java:1169)

                at com.ibm.team.scm.client.importz.internal.ChangeSetArchiveImporter.setContents(ChangeSetArchiveImporter.java:1066)

                at com.ibm.team.scm.client.importz.internal.ChangeSetArchiveImporter.performModification(ChangeSetArchiveImporter.java:1206)

                at com.ibm.team.scm.client.importz.internal.ChangeSetArchiveImporter.collectChange(ChangeSetArchiveImporter.java:664)

                at com.ibm.team.scm.client.importz.internal.ChangeSetArchiveImporter.collectChanges(ChangeSetArchiveImporter.java:601)

                at com.ibm.team.scm.client.importz.internal.ChangeSetArchiveImporter.commitChanges(ChangeSetArchiveImporter.java:586)

                at com.ibm.team.scm.client.importz.internal.ChangeSetArchiveImporter.importChangeSetArchive(ChangeSetArchiveImporter.java:334)

                ... 10 more