On Wed, Sep 22 2010, CHENG Gao wrote:

> ,----
> |  Wrong type argument: arrayp, nil
> `----
>
> nnimap buffer for gmail is empty.

M-x toggle-debug-on-error

May give you a backtrace.

-- 
Julien Danjou
// ᐰ <julien@danjou.info>   http://julien.danjou.info