Hi,
Also have a look here:
Can't set value on item because the item can't ... | SCN
Exception: Can't set value on item because the item can't get focus
Item - Can't set value on item because the item can't get focus. [66000-15
How to get value From CFL into matrix
Can choosefromlist return 2 value
Hope it helps.
Thanks & Regards
Ankit Chauhan