Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5fac158fb4a7b18ec1b6f53ef90928c3e0e74459fad7929b159bf446244f5cbb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^