Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> dd748f7117a9e9e9b828363d7fc6e35feda5df2bfe9fb7e42072c6e4fb4b479c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^