Storyline 3 error with translation imports

SL3 won't let me import a translated xliff file. As soon as I click the file to import, an error reporting box pops up. Here is the text in the "provide more information" link:

<?xml version="1.0" encoding="utf-16"?>
<ErrorReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<FirstName />
<LastName />
<EmailAddress>bmjenson@amazon.com</EmailAddress>
<MachineName>SEA-1800030315</MachineName>
<HardwareId>WF3LU-AUFL6-UAX2R-WQ9RP-1TV9U</HardwareId>
<Message>An item with the same key has already been added.</Message>
<StackTrace> at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
at anw.pw(String A_0, anc A_1, IEnumerable`1 A_2)
at Articulate.Globalization.TranslationProvider.a(IList`1 A_0, String A_1)
at Articulate.Globalization.TranslationProvider.f()
at Articulate.Globalization.TranslationProvider.a(Object A_0, EventArgs A_1)
at Articulate.Globalization.TranslationImportResult.OnShown(EventArgs e)
at System.Windows.Forms.Form.CallShownEvent()
at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme)
at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)
at System.Windows.Forms.Control.InvokeMarshaledCallbacks()</StackTrace>
</ErrorReport>