Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f31ff609715a970b4a1616d4bd229ae1850011fc9a47a6dd33f8dbeaa6692ad7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^