Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8aa75b50d3f12b5c08b08a9cea6347e19b88519ed643bf4af7b48f58923b45fa:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^