Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> acaa09a0eb1ff00eda1e723269c86ff711ea6cb8db2ad6022ff53a10f0987e3c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^