Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0c7938d909593ef51814103e9ee1ccc5107ac30922b55f3679d58aad241d9ee3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^