server returning null tokens

[davinci]

Hi guys i have been trying to use this awesome library in my project but im running into several problems

the following fragment returns null

 $token = $this->server->requestToken();

           Log::write("debug", serialize($token));

echo $token;

and thus when trying to consume i'm getting this error

The server "http://example.dev/account/oauth/token" did not return the oauth_token or the oauth_token_secret

i'm currently using 175 version 

the log file has the following entries 
2013-03-24 13:59:17 DEBUG - b:0;
2013-03-24 13:59:56 DEBUG - b:0;

thanks