Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 20889b1ad0785306a308bfcf6cedcf12c7626072c96038878c9160bd7d9dbac6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^