Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> afded1e5a257c5c4ae89d243764dd5ba4225f04576d88c0255ad9928d4b3c04b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^