I have 2 mobile phones and 2 different Zoho notebook accounts ( A & B). When I tried to share one note card I created (A) to my another account (B), I got an error message "Receiver is not a Zoho user". But I have already used such receiver's account (B) to create more than one hundred note cards. Why did I get this error message? I also got problem to share note cards from my account B to A even though I didn't get any error message. I couldn't find any shared note card from my account A.