Classname - error message
Description
The classname of the element in which the error is displayed. Leave blank for default class.
For step by step instructions on how to add a new CSS class in order to customize an error message see the Classname - field with error page. Once you have a component that can generate a validation error, assign the 'Classname - error message' property to a new CSS classname.
The CSS class can then be defined in the Local CSS definitions property.