Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fd9df05274afeaa2316d54dd0875eb5b85f44ef42dd5f4eae56a7de5ee8c6ef2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^