Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e9c40a33cfcc0d3344e5aa0f14ededdbfcf5d3f9703c7982b0df14c9dd54cc19:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^