Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0ff48c848e53324940dc6a6de1cef93c7c7b4eceaa9114c3707ac304abeb5a7c:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^