[jivago]

Open your database, search table “wp_usermeta”, check meta_key “nicname” and change “meta_value” to your nicname for user admin in wordpress.

This was the problem in my case. I hope help you

Sorry for my english

[jivago]

Hello, I’ve had the same problem today with a fresh installation of bbPress and WordPress.

I found the solution changing the root nicname, not called admin.

The nicname of bbpress was not like in wordpress despite having given correctly in the installation.