B.14 Illegal character in array arg

You have used a character in the argument of a tabular or array environment that is not allowed. The standard available characters are: r (right justified), l (left justified), c (centred) and p, as well as @{<inter-col text>}. Remember that if you want to use the >{<decl>} or <{<decl>} specifiers, you must include the array package.

This error will also occur if you have forgotten the argument to the tabular or array environment.