Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2656bafc9ebe76d8a45cc9dec5de05c556c5ff3e3a01e33e4098bb28101cd5c7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^