Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f27a28f6d5f0db263ff0b9ae2111f2d9032d3610b91f1510d1f85475116e58c8:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^