Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b0a51fd82ddb05ec120998bab5180f96d297b6b886a5fb06802da93e499a58a1:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^