Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d7c2089368aa91b785a56b85d9ef1dd48aa1cead7feedeb3e1c44b454950190b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^