Ok I already answered the same question twice and i'll do it once more
^Click them for a link
Some games have bad effects when time is altered on your DS, whether it was your fault or not. Some effects could be the game disabling time-based events like the item transfer, or exhibiting strange glitchy effects when trying to access these.
PS: It could be a glitch, and it looks like others are having the same problem hence why I just copied my last answer. -My last question
This is the exact same question so I will answer it with the exact same answer. I'm sorry but you might not be able to transfer another item/ Pokemon. No game/ demo is perfect and like those other questions it is obviously a glitch in the game if your all getting the same thing happening.
PSS: Anyone reading this thinking about asking the same question again please don't. It's just asking the same answer as the last ones. If these answers I gave are wrong tell me or report it.