Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> cb08663bac11d327e9cb914981c900f3fd7d62c9fbaa8ee6f6fed7dc52a84ec1:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^