Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 82ae12b7ea066613b0a5bb08d690ca36fb20fcd786351cbdbde12ed561a1eb5b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^