Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f7099cf7015f90097c5f090f379c4207ff05f29f8b734119a8951bf6a8ee68e2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^