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Note: OOG = “Out Of Gas”
The smart account’s validateUserOp function encountered an issue:
  • It may have reverted unexpectedly
  • It may have exhausted its gas allocation

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Troubleshooting Steps

  1. Gas Limit Check:
    • Increase the verificationGasLimit to cover validateUserOp costs, if it is less.
  2. Logic Verification:
    • Review validateUserOp implementation
    • Confirm the user operation’s validity
  3. For Non-Paymaster Scenarios:
    • Verify sufficient native tokens in the sender address:
    const neededFunds = calculateRequiredPrefund({ userOperation });
const accountBalance = await client.getBalance({
  address: userOperation.sender,
});
if (accountBalance < neededFunds) {
  throw new Error("Insufficient funds in sender account");
}
  4. For Paymaster Usage: - Ensure paymasterAndData is properly set: 
    const opHash = await bundler.sendUserOp({
    paymasterAndData: "0x3b912be0270b59143985cc5c6aab452d99e2b4bb0000000000000000000000000000000000000000000000000000000064c0957400000000000000000000000000000000000000000000000000000000000000007d99385d8ef0af67affbf9944df8c121e9d1f6aef8dd82a4aeb5db310c42d3dc5b51c9e0835d94c3b22564d3d94f0e1d14e37571e46651da8de567d128a361a01b",
    // Additional operation details...
})
  5. Signature Verification:
    • Ensure your implementation doesn’t revert for invalid signatures
    • For non-time-sensitive operations, return uint(1) for invalid signatures
  6. Advanced Debugging:
    • Utilize tools like Tenderly for in-depth analysis