Uniswap Universal Router
error InvalidCommandType(uint256)A transaction that reverts with the raw data 0xd76a1e9e hit the custom error InvalidCommandType, defined in Uniswap Universal Router. The explorer shows the hex because it does not have the contract's ABI to translate it.
The router received a command byte it does not recognise, which means the calldata was malformed, almost always a buggy or incompatible integration.
Use the official interface for the trade. If a third-party dapp produced this, report it there.
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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.