# DuplicateUids (/docs/errors/chain/DuplicateUids)

The `uids` vector passed to `set_weights` (or a reveal) contains the same UID more than once. Deduplicate the uids/values pairs before submitting; each target neuron may appear only once per weight vector.

Declared by the `SubtensorModule` pallet; it classifies to the semantic code [`invalid_argument`](/docs/errors/invalid-argument).

## Remediation [#remediation]

Check the argument values against the operation schema

The same explanation is available in the terminal: `btcli explain DuplicateUids`.