Hi April Joi,
Could you please specify more on this issue. Which app are you exactly talking about?
Are you using Adobe Reader on your Galaxy tab? Have you signed in to your "acrobat.com" account using Adobe credentials.
What exactly were you trying to do?
Please attach the screenshot of the error message(using camera icon) so that I can analyze the issue at my end.
Hope to hear from you.
Regards,
Anubha