Overflow

A checked arithmetic operation overflowed, e.g. incrementing NextSubnetLeaseId when registering a leased network, or adding to a crowdloan's raised amount or contributor count. Internal guard; inspect the amounts involved as this should not occur with realistic values.

Declared by the SubtensorModule, Crowdloan pallets; it classifies to the semantic code internal.

Remediation

A chain-side invariant failed; nothing to fix client-side — report it if it persists

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