Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d05f03db3425ad8e22be192560e15a96567fbd6a18b1be544eaac26803457022:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^