What does missing a widget mean?

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I see hundreds of these messages every day. How do I fix this? Here is the link to the code: https://github.com/charlotte-ruby/impressionist/blob/master/lib/impressionist/counter_cache.rb#L69

E, [2020-01-18T04:00:46.228763 #32327] ERROR -- : [1b90f2cc-f2f9-4390-be16-53f72a8485ad] Couldn't find Widget with id=1572214757
E, [2020-01-18T04:02:58.291911 #32345] ERROR -- : [682a3d2f-2d27-4a16-91bc-a100340cc46e] Couldn't find Widget with id=1493586987
E, [2020-01-18T04:05:32.360946 #32327] ERROR -- : [d8def311-8404-4f91-a5ff-561d2d0bb9fe] Couldn't find Widget with id=1572214757
E, [2020-01-18T04:11:16.327019 #32329] ERROR -- : [6701b633-4f34-4bfe-9513-e3a25e4dba52] Couldn't find Widget with id=0
E, [2020-01-18T04:24:57.493412 #32340] ERROR -- : [5696d797-15bd-4a8b-aa62-93ee16b978e3] Couldn't find Widget with id=1493586987
E, [2020-01-18T04:25:02.188741 #32340] ERROR -- : [bc572700-18e3-4215-ac3b-2b6fa60cb771] Couldn't find Widget with id=1493586987
E, [2020-01-18T04:26:03.390295 #32327] ERROR -- : [29c216b3-ec8f-4fb6-b50b-da8a902cee79] Couldn't find Widget with id=1493586987