Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ef9fbdb972465a2d9d43f6ceff0072b01b09ea5306a6f01c0f843a90f36fa0a9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^