Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1f98a5e9ed2b5187cd8a62b78230a854aa04a0d217033c6f6986192cb88a5300:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^