Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2f71fabcd902927bf0d9e309f5787285265ecda8f2deff359b0dbf21e977fe4d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^