Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ded3d8dfe1b280b08fc228e18a783af862952f7921c716f5891c1213215cf183:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^