So you just forgot to put
\usepackage{multirow}
into your minimal example above, Clemens noticed that already. That's the reason for the
Undefined control sequence error.
The error
Missing number, treated as zero comes because you did not set a width. Have a look at the link to the multirow documentation, provided by Clemens above. The syntax for
\multirow
is
Code: Select all
\multirow{number of rows}{width}{text}
it also supports two optional arguments, which you did not use.
So, in your example, this would work:
and also this:
with
*
as indication for using the natural width of the text argument.
Stefan