Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6ea609df962689cd1ce89d91d726f2bd4c0f64668af6c58dbc9251c50ebc1ec4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^