1. That error is on the recent products block a favorites case although I dont know how that would be triggered so might have to look and see how that case is called
2. The second one is in member.php and again your userid variable is empty just like the first error. My suggestion although again maybe its a bot doing it I would suggest in member.php line 518 this line making it this encapsulating the $uid variable just so it does not throw an error if its 0
Code:
Content visible to verified customers only.
3. Same thing line 355 in member.php try making the line this
Code:
Content visible to verified customers only.