Beamer document: Undefined control sequence

[Rich Shepard]

I copied a .lyx beamer class file to a new name and am modifying the copy
for a different presentation. (I did this because I like the layout in the
original and copying is a quick way to get that in the new document.)

However, when I compile it (pdflatex) using Ctrl-h an error box displays an
undefined control sequence in \makebeamertitle only the copied file, not the
original. Yet, the .pdf file is produced and displays. A mwe.lyx is
attached.

While I close the error box and go on, I'd like to understand what broke in
the copy so I can fix it.

I hope you're all healthy -- and stay that way -- and coping with the
pandemic and economic disruptions.

Regards,

Rich
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#LyX 2.3 created this file. For more info see http://www.lyx.org/
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Title
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Subtitle
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Rich Shepard
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Richard B.
 Shepard, Ph.D.
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Applied Ecosystem Services, LLC.
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(Copyright 
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copyright
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 2020 
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Applied Ecosystem Services, LLC
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)
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%
\backslash
beamerdefaultoverlayspecification{<+->}
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\begin_layout Section*
Introduction
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