Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fdbca30cd5d735f5edf4b829644462b2990c7eeaf595fa130dd097a3b84e3ec3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^