Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8b82b5478ea2eca332bcbd984a2456ae34feaeb58ced0690d253dbb66dfebca7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^