Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b6ee24f2b188e7883ebbe40d8d575ca564d8327d72bead005aa661c5029b51af:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^