Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0fa9e25042ca8c35dc243e8ecae95203af6485542c583c07c6db16f0a3103830:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^