Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d390b0dcaca3db967677653ff7f2781fd1f6547992f0f6cd90bf525df1a5d261:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^