Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> be923ffc8e4fbdc32cdd54e9d52a8abc0c570a83db638b4adb4a2624230bfb7b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^