The VoterUpgradeableV2.distributeFees() function distributes fees to a list of gauges. It calls the gauges.claimFees() function at L400.
The gauges.claimFees() function calls the feeVault.claimFees() function at L394.
In the feeVault.claimFees() function, it checks if gauge is registered in the Voter at L72.
However, as the VoterUpgradeableV2 contract does not have the isGauge function, this function call is reverted.
Add the isGauge function and poolForGauge function to the VoterUpgradeableV2 contract.
