Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c3c4db1c8be350e32ff4998c98515031015673c5073f960af4a690f027719eff:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^