[Tutor] Key Error

[Sara Johnson]

Sorry, this is probably too general a question, but I can't find any specific information on it.  What exactly is a "key error" and how do I clear it?
   
  I entered something like this:
   
  abcd=h[key]['ABCD']
   
  and when I run it I'm getting 
   
  KeyError: 'ABCD'
   
  What does this mean?
   
  Thanks!

       
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