Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b315dc3e0e384b15f1a1afc395b3dbad4446ff98ee2969df793e9254ed12e90f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^