Creating new connection string in Sitecore throws exception

I was trying to add new publishing target into my Sitecore 9 instance when I received this error message while logging into Sitecore or doing basically anything with Sitecore: Textual representation of exception: Server Error in '/' Application. One or more exceptions occurred while processing the subscribers to the 'property:changed' event. Description: An unhandled exception occurred... Continue Reading →

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