Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 24895417db366a2c7cefc3e43d1b3bd5a00b9be83ce4e4af6458dbfafd70a9be:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^