CODE_ERROR

There is an error in the cadence code of this transaction.

[Error Code: 1101] cadence runtime error Execution failed: error: underflow --> 4b7e4e86d60473c4cee286a4c09cf6ba30391a2faa5076425581b09e58de6004:15:458 | 15 | let swap0InVault <- flowTokenVault.withdraw(amount: cur);let swap0OutVault <- SwapRouter.swapWithPath(vaultIn: <- swap0InVault, tokenKeyPath: ["A.1654653399040a61.FlowToken", "A.b19436aae4d94622.FiatToken"], exactAmounts: nil);let swap1OutVault <- UsdcUsdtSwapPair.swapToken1ForToken2(from: <- (swap0OutVault as! @FiatToken.Vault));let tokenOutVault <- FlowSwapPair.swapToken2ForToken1(from: <- (swap1OutVault as! @TeleportedTetherToken.Vault));;earn = earn + tokenOutVault.balance - cur;... | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^