drop enum problem

On a LInux 64 biut system:

$ psql
psql (9.1.0)
Type "help" for help.

gavin=> DROP TYPE raindow;
ERROR:  type "raindow" does not exist
gavin=> CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green',
'blue', 'purple');
ERROR:  type "rainbow" already exists
gavin=>