Still problem of saving/loading an inventory<solved>

Hi my friends, in order to make my problem much clear, I did a simple example, the displays and events shown as blow:

I read the explanation of these two actions:

I don’t think it’s difficult to understand, and I used STRUCTURED variable in this case as wiki said , but the running results showed that I neither succeed in saving part(nothing in structured variable “temp_save”) nor in loading part(failed saving then failed loading)!
I didn’t figure it out for a long time.
I really need your help! Thx in advance!!