Wine's library path

I just installed Wine (1.8) and Q4Wine (1.1), in order to run a win application.
But every time I execute the application, a message appear saying:

Error while loading application settings. wine’s library path for 32 and 64 bit is not set.
Please, go to the q4wine options dialog and set at least one path.

Where can I set the Wine’s library path?
And, where are the libraries for Wine?

Thank you, in advance.