Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 52d2a3954573a0a0f5d89a5e9818ff8bf608dcc667927369096de0b8d3877155:23:212
   |
23 |                                         let token1Vault <- UsdcUsdtSwapPair.swapToken1ForToken2(from: <- (token0Vault as! @FiatToken.Vault));let vaultOut <- FlowSwapPair.swapToken2ForToken1(from: <- token1Vault);earn = earn + vaultOut.balance - cur;flowTokenVault.deposit(from: <- vaultOut)
   |                                                                                                                                                                                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^