Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 32376bd4cc990be4c8ac24041db1e0c7a1485cb817ae4e9ad4f15168b340be51:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^