Error AA10: Sender Already Established

The smart account (sender) has been previously set up. You might be attempting to initialize the account more than once.

Potential Fix

Eliminate the initCode from the user operation:

const operationHash = await bundler.submitUserOp({
    // Remove this line
    // initCode: "0xd74a8b63df73223fcc89f604d6738e66719dbc...",
    // Add this line instead
    initCode: "0x",
    // Other user operation details...
})