LaTeX Error in dylanadi style file

[fact0real]

Hello,

I got this error when I was trying to compile pdflatex dylanadi.tex:

... [above lines omited]
(/usr/local/texlive/2025/texmf-dist/tex/generic/pgf/frontendlayer/tikz/librarie
s/tikzlibrarycalc.code.tex)
(/usr/local/texlive/2025/texmf-dist/tex/latex/fourier/fourier-orns.sty)
! LaTeX Error: Command \caution already defined.
               Or name \end... illegal, see p.192 of the manual.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...

l.2283 \newmdenv[style=warning]{caution}

Please help to resolve this issue.