Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 01e0d98fa2bf0c294d6438787e9ca27fdf9123fe95a81d41129502eb10cbef45:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^