Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9ce7ef7d44220d239fdead43cb22a4321c813b1c0b14493f279d2b741f024fd7:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^