Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 81ff83bf3943a50f1841df092369f85450f8fd3b8259c666abd56f1ee04a9d3b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^