Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 44fdc048f3a0d6b99e4f15fbbd3d8623f39734d356726e581a77db9b6b01b421:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^