VBR00457 — This key is already associated with an element of this collection

Severity: Error · Family: VBR (runtime semantics) · Source metadata: VBRuntimeErrorInfo

A key is already used by an element of the collection.

MS-VBA run-time error 457; the numeric portion of the code is the error's number. This code is raised by IStdCollectionClass, StdCollection.

How it is raised

Situation	Example	Resolution
A key is already used by an element of the collection.	`c.Add 1, "k"` twice	Use a distinct key.