Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> bb96f83918105ec0010bcc601894c9d8d0e968cb925ec83c3fdadf146a7bb0fa:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^