Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2495b1fd911323268c51e1aa0741aa01618c0bf96d8eb1b8b2f0f16917bc842a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^