Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b6acf6d8e8f102da5b2d7e6992b2ab36b8ca93a2ca326b0fc28b394b2d95390a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^