Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fa8dc887df1f8caf15cf19b29d10cead15d39ff0da65e916614ff28ebe9bc876:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^