Deployment exception

Hi

I have developed a webdynpro app. when i deploy..it asks for sdm password..which is sdm, this is successfull, but it then says deployment aborted with this error message

Deployment exception : Server Rakhee did not accept login request as apiadmin on port 50018 - Cannot log in. There are already active sessions:

Session id 0 / An administrator logged in via GUI /

Inner exception was :

Server Rakhee did not accept login request as apiadmin on port 50018 - Cannot log in. There are already active sessions:

Session id 0 / An administrator logged in via GUI /

I assume my server settings is not set correctly..

Any help on how to solve this.

Thanx

Rakhee