Access denied adding site collection to content database

Hi!

I'm getting the message "Sorry, this site hasn't been shared with you" whenadding a site collection to a content database. Here's the snippet:

                                        SPSite newSite = contentDatabase.Sites.Add(
                                            newSiteCollectionUrl,
                                            siteTitle,
                                            siteDescription,
                                            lcID,
                                            webTemplateCode,
                                            firstAdminLogin,
                                            firstAdminName,
                                            firstAdminEmail,
                                            secondAdminLogin,
                                            SecondAdminName,
                                            SecondAdminEmail);

This works just fine in development environment, but in quality the message is presented. I've read and tried a lot of solutions found on Google, but I couldn't found any that seems to work. Any tips?

Thanks