After update, JFBconnect gives a warning/error

My joomla version: 1.5.26 with virtuemart 1.1.9
My JFBconnect version: 4.3.4 (JFBConnect-4.3-Joomla15_20130104)

I updated my JFBconnect version from 4.2 (JFBConnect-4.2-Joomla15_20120425) to 4.3.4 latest version,
After update, JFBconnect has begun to give an error when a facebook user registers to my joomla&virtuemart web site as you can see in the picture attachment.
Facebook user comes to my web site and he clicks on "login with facebook" button, JFBconnect gets his "first name, last name, email, city, country" information, then page displays "registration form" which gets user's other necessary info for virtuemart registration. After user clicks on "save" button under "VM reg.form", page refreshes itself and on the left side, user can see "welcome user's firstname user's lastname", "account details", logout button BUT no facebook profile avatar. And on the main page user can see products. ALSO, on the top of the page, JFBconnect gives an error.
If user clicks "logout" button, then clicks "login with facebook" button again, it doesn't display any warning/error, it displayes user's facebook profile avatar, everything is okay.
I want to get rid of that warning/error when a user registers on my web site, so I need some help please.
Also, why doesn't it display user's facebook profile avatar at the first time after registration?