Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7fb18b7d0906da97ab7d795e9713689d3aa5d42a7e3b87e6fe136576ff0a34ae:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^