Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 23d4d8b9114a3599e0814f41cadc40fc90cad7ee2d78f730a4440d091d8b4fe2:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^