Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> be21d802e0a1d423f7e676d46140b4dd94b40d060fd7fa29c56a9aa81fd4ce00:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^