[Koha-devel] reinstalling koha with same error DB

What is this? I did the following: mysql -u root -p mysql After password I was dropped into mysql database. drop database Koha; successfull. DELETE from user WHERE User='kohaadmin'; successful. SELECT * from user; It shows there is no kohaadmin user in it. Now the error below, what can it be? thanks for any hints. CREATING DATABASE Creating the MySQL database for Koha... 0ERROR 1062 at line 1: Duplicate entry '%-Koha-kohaadmin' for key 1 connected to your DB. Checking & modifying it Adding marc_word table... Adding marc_biblio table... Adding bookshelf table...