Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 316e9cd5cb27a2c4b39be98bec5bf5c970ff3d7e9bb613a26be3955cdaa7d50c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^