After defining an Attribute with rules, any modification (Edit/Update) on the rule gives the the following error "Error happened"
For example you can create an attribute with Control type "TextBox" and Validation rules "Min 1 Max 31". After any modification, for example on "Text prompt" gives you the error.
It was a bug in the 3.90 but it has been fixed in the 4.00. Just add [ValidateInput(false)] attribute to ProductAttributeMappingUpdate method of ProductController
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