Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5910ee71bc0e140cbc98cf297e957db79b6b29328c171e9e1f60a478fede0e37:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^