As user WilDNature reports the very same error message just 3 posts above yours I assume you didn't read the readme.txt of the trainer as well.
From the readme:
Activating this trainer
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
Does this work for you?
I open Factorio Trainer (run as administrator)
I open Factorio game (steam)
I press F1 at main menu
Listen for "please wait"
After a few seconds listen "error"
Factorio Trainer log:
20:01 Trainer version: 1.32
20:02 Error at #health: Cannot find AOB
Previously the item that was incremented was the item "in hand", as well as the one that was just dropped (worked in chests)
Now, the item that occupies the slot where the item you picked up was is the one incremented, so in order to increment a particular item you have to pick it up and drop it back into your inventory.
Items from the main inventory dropped in the quick bar have to be picked up and dropped a second time from the quick bar to start incrementing (otherwise whatever item occupies the previous main inventory slot increments)
Getting items that have been dropped into chests incrementing works sometimes and sometimes not. I haven't figured out the criteria to make it work 100%.
Now switch to another chest and pick up and drop an item in that chest (it may fail)
Also, editing a post seems to pull the html out with it causing edits to fail due to site posting restrictions.
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