Sorry to hear you’re having trouble with Smart Office.
Are you by any chance using two factor authentication for your Google account?
If so, SmartOffice does not use two-step verification for signing in to your Google Drive account. Please visit https://accounts.google.com/b/0/IssuedAuthSubTokens from a desktop computer. Please scroll to the bottom and generate an application-specific password for SmartOffice.
You should then be able to log in using this password in SmartOffice, and access your Google Drive.