Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5297159cd56c8657ac926de9e29eb36d38d34dffa28328629f30d4c5966dcbc3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^