Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a38b276be0e1f5f788a93419d15be154d20c2d7e5912b2dab09bb6fb858d21e2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^