Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8bc85c3fe82dd4606f68bac7f8ce466f66acb1fca86799afd5fcf8e8b3c56a53:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^