Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4b55ae2088cbba7a19de793a9276c6a4c9d47e8001ec83ff121992b5591c56b4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^