Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1563390432cb5861d20e633cb77221efc4bbc1b01d0a6f45fc59a509261f642c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^