Preview and publish crashes

I have a single slide file... very simple tab interaction in storyline that is continually crashing when trying to preview or publish to review. Getting this error message ...

<?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">
<UserId>aid|fd3aa601-77f5-401d-a8e0-c0dacf51f140</UserId>
<HardwareId>VF3Y1-AUFFQ-SCMYG-SN6RP-1TVVU</HardwareId>
<Message>Unable to translate Unicode character \uD83D at index 218 to specified code page.</Message>
<StackTrace> at bool System.Text.EncoderExceptionFallbackBuffer.Fallback(char charUnknown, int index)
at bool System.Text.EncoderFallbackBuffer.InternalFallback(char ch, ref Char* chars)
at int System.Text.UTF8Encoding.GetBytes(Char* chars, int charCount, Byte* bytes, int byteCount, EncoderNLS baseEncoder)
at int System.Text.EncoderNLS.GetBytes(Char* chars, int charCount, Byte* bytes, int byteCount, bool flush)
at int System.Text.EncoderNLS.GetBytes(char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex, bool flush)
at void System.IO.StreamWriter.Flush(bool flushStream, bool flushEncoder)
at void System.IO.StreamWriter.Dispose(bool disposing)
at void System.IO.TextWriter.Dispose()
at void System.IO.File.InternalWriteAllText(string path, string contents, Encoding encoding, bool checkHost)
at void System.IO.File.WriteAllText(string path, string contents)
at void Articulate.Player.PlayerWriter.a(bwFonts A_0)
at void Articulate.Player.PlayerWriter.b(bwFonts A_0, bwFrame A_1)
at bool Articulate.Player.PlayerWriter.Write(IPlayerContentProvider contentProvider)
at void or.n()
at void Articulate.Design.Publish.TargetContext+PublishBackgroundWorker.OnDoWork(DoWorkEventArgs e)
at void Articulate.ComponentModel.STABackgroundWorker.a(object A_0)</StackTrace>
</ErrorReport>