problem checking out graffito source

Hi,

I am using tortoise-svn on windows. I created a new windows folder
e:\graffito-new and tried  to checkout graffito source code from
|http://svn.apache.org/repos/asf/incubator/graffito/trunk|

But I get error :
Working copy  e:\graffito-new is already locked. Please do cleanup.

I do clean up and perform checkout again . It does not work.
I delete the directory and create new folder . \

Perform above steps again . It comes up with the same error.


What am I missing ?

-Ruchi