Uniswap Permit2
error InsufficientAllowance(uint256)A transaction that reverts with the raw data 0xf96fb071 hit the custom error InsufficientAllowance, defined in Uniswap Permit2. The explorer shows the hex because it does not have the contract's ABI to translate it.
The Permit2 allowance for this token is smaller than the amount the trade needs.
Approve the token again for at least the trade amount, then retry.
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Every selector on this page was computed as the first 4 bytes of keccak256 of the signature shown. A selector identifies a signature exactly; on rare occasions two different signatures share one, so the transaction decoder is always the more precise answer.