# Validation Errors

Please see below a reference to each [@aurelia/validation](https://github.com/aurelia/aurelia/tree/master/packages/validation) package related error with explanations and resources for debugging and solving.

## Validation Core Errors (4100-4109)

These errors occur in the core validation functionality including rule serialization, deserialization, and rule provider operations.

* [AUR4100](https://docs.aurelia.io/developer-guides/error-messages/4100-to-4106/aur4100) - Unable to deserialize expression
* [AUR4101](https://docs.aurelia.io/developer-guides/error-messages/4100-to-4106/aur4101) - Rule provider no rule found
* [AUR4102](https://docs.aurelia.io/developer-guides/error-messages/4100-to-4106/aur4102) - Unable to parse accessor function
* [AUR4103](https://docs.aurelia.io/developer-guides/error-messages/4100-to-4106/aur4103) - Serialization display name not a string
* [AUR4104](https://docs.aurelia.io/developer-guides/error-messages/4100-to-4106/aur4104) - Hydrate rule not an array
* [AUR4105](https://docs.aurelia.io/developer-guides/error-messages/4100-to-4106/aur4105) - Hydrate rule unsupported
* [AUR4106](https://docs.aurelia.io/developer-guides/error-messages/4100-to-4106/aur4106) - Hydrate rule invalid name
* [AUR4107](https://docs.aurelia.io/developer-guides/error-messages/4100-to-4106/aur4107) - GroupRule no scope
* [AUR4108](https://docs.aurelia.io/developer-guides/error-messages/4100-to-4106/aur4108) - GroupRule invalid execution result
* [AUR4109](https://docs.aurelia.io/developer-guides/error-messages/4100-to-4106/aur4109) - Invalid rule execution result