Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5cff1e5bd2adb3ee5faba9f3b768d2428b3ee3dcec567a517a29a15be8ec684b:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^