Do you see the red X in the upper left corner of the init global examaps block?
Right click on that block and try to clear the error.
The error message is saying that the 'school' key is not found in the examaps dictionary.
Retype and reinsert the same school text block in the examaps and get value request, to make absolutely sure they match. Use the AI2 Copy Block to be sure. Make sure there are no leading or trailing blanks around the word school.
and because of these (or something else), global examples has an x and that means it will return nothing and nothing is not a dictionary
and your trying to get a value for key from nothing
now see the full image:
Two other possibilities here are that the companion version is fairly old, or that this is the iOS companion where the publicly available version doesn't yet implement dictionaries. Both could result in the initialize block error.