The citation "spanish" is broken. Commenting it out at least fixes
the compilation.
spanish
\family default
en su página web,
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
\begin_inset CommandInset citation
LatexCommand cite
key "spanish"
literal "true"
+\end_inset
+
+ <- broken citation
+\end_layout
+
\end_inset
.
\end_inset
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
\begin_inset CommandInset citation
LatexCommand cite
key "spanish"
\end_inset
+<- broken citation
+\end_layout
+
+\end_inset
+
.
\end_layout