Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b77505e5c649bf98fa470f7727f37ae17d9ea385cce6ad55b26fe6ce3a3e6aa9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^