Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4c4ed85649df659bd28807bf97e1c4ce636b9aba59af00ad0139b6ad423cf3b3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^