lemon on Nostr: Sorry for hassling, but I appreciate the help! I don't understand why I'm seeing this ...

Sorry for hassling, but I appreciate the help!

I don't understand why I'm seeing this error:
"Not enough funds available (1) for swap amountToSend: 1 + fee: 0 | length: 1"

To me this means:
1 sat is available.
1 sat is intended to be sent.
No fee.
1 proof of 1 sat to send.
Yet 1 sat is not enough to send 1 sat?

From this code:
cashu-ts/blob/main/src/CashuWallet.ts