Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ff5680878fe04ee25e0c163e987f7a07f5e59c530d3227c235b0b0ccaafb8718:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^