A FormResult represents the result of a form validation. There are 3 different states :

• Valid reprensents a successful validation and holds the form result
• Invalid reprensents a failed validation and holds the form errors
• Error represents a misconfigured form and holds the configuration errors

A ConfigError represents a configuration error on a Field. It usually happens when there is an error in the Fields or the Validate function :

• MissingField when the field cannot be found
• WrongType when the field has a different type of Value

Note: if you have trouble debugging those errors have a look at the README troubleshooting section