Actually - I think I figured it out. It must have happened when I was doing the Telerik removal. Looking at an earlier version of the web dot config , I see that the missing tag ( with key set as ValidationSettings:UnobtrusiveValidationMode) , inside appSettings is just underneath one of the Telerik reference lines that were manually removed (by me) . I must have accidentally removed the line below, and cause the error. Here's a screenshot showing the webconfig (before the telerik removal):
https://www.santacruzcountyca.gov/lastconfigfile.png
Thanks for your help
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