Custom error class

[MrSquaare]

Is your feature request related to a problem? Please describe.
Throw errors use the Error base class, it is difficult to process the caught errors differently (e.g.: with an exception filter)

Have you read the Contributing Guidelines?

Yes

Describe the solution you'd like
Use custom error classes
This would also allow adding a context (ex: I have two entities A and B with a many-to-many relation, I add several relations A to B where one is invalid, the custom error could contain the list of invalid identifiers)