Undefined control sequence.
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\kvtcb@fonttitle ->\thechapter
\noindent
l.627 \begin{regexbox}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
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