Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a26ca5ec62071adb1d43c96d17d6419ac6e2c60ab6a11d76c5ca909f5afc500f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^