Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f8e38b41bb58bc39395ca4a59e62b92312455af58a5c34a781fd20df1c9e6558:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^