Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 960ba4f7cfe53f689c065e93fa6512cbf30c2a73aa777efbe50f3f6c3e5a1f19:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^