# Strange “missing \item” problem in enumerate [closed]

According to this website, the following should work:

\begin{enumerate}[I]
\item foobar
\end{enumerate}


Yet, I always get the same error, with any of the [] options:

! LaTeX Error: Something's wrong--perhaps a missing \item.

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

l.143   \item f
oobar
?


When I leave the [] options out, I get no error whatsoever, and it works like it should. I need to use capital Roman letters as symbols though, so I need to solve this problem.

Does anybody know what I might have done wrong?

-
Are you loading the enumerate package? It doesn't seem so. –  egreg May 15 at 8:47
Check the website: \usepackage{enumerate}. –  Martin Schröder May 15 at 8:47
Hmm, it seems like that was the problem. I thought I already had the package loaded, because enumerate was working. –  Lee White May 15 at 8:54
@ArnoSluismans The basic enumerate environment is built in to LaTeX, but without the extras provided by the enumerate package. –  Joseph Wright May 15 at 8:55
I see, thank you. –  Lee White May 15 at 8:55