Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ff6a204cc7dffb45e2ba5429f46ff98a3cc520c3be4ee72d3d8fc0b1b1a4d12d:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^