Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d00d18969a2668a6fe757fe26a51ebc07ad4b4af2426fd44911d0b75745d41dc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^