"Chrome violations" don't represent errors in either Chrome or your own web app. They are instead warnings to help you improve your app. In this case,
took 83ms of runtime are alerting you there's probably an opportunity to speed up your script.
("Violation" is not the best terminology; it's used here to imply the script "violates" a pre-defined guideline, but "warning" or similar would be clearer. These messages first appeared in Chrome in early 2017 and should ideally have a "More info" prompt to elaborate on the meaning and give suggested actions to the developer. Hopefully those will be added in the future.)
~ Answered on 2017-06-29 11:52:23