Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 06930065da2e69dda7287362435eeea983626efce335599d815f964686273bc4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^