Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1f6af66cdcf040013729382f874db89fc9be63e485784a3dd266dcaa117bfc23:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^