Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6e41cf34a2a4c85d722b77793654ab21c8aa47ad4b63e957afa1b2a15be7f81e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^