Datelist element in webform not working I was just going through webform configurations and I changed the date list element format from default to raw. After doing this Im not able to add any element of type dateform to my webform and also not able to open the element configurations also. The error i get when clicked on element tab (refer the attached image) is "The website encountered an unexpected error. Please try again later."
This is a bug. I created Issue #3029964: Datelist element in webform not working in the Webform's issue queue.  Please try the provided patch.