#3 error installing

[Anonymous]

i tried to install the forum but when i go to the
setup.aspx and run it i receive the following error.

Error in Processing
Error: Cannot start your application. The workgroup
information file is missing or opened exclusively by
another user.
Action: Please go back and try again.

the server of my webhost has 2 folders:
webroot
database
i uploaded all the files from Chimaera to the folder
webroot.
Can you tell me what to do, please.
Thank you very much.
Luis J.