Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b111ffd09f3be0fb59960228506e9cad2be87f48ce43b0b1c32bec0fa478b0c3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^