Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 91777e3e38826ea056aebb14fd0f772af98a7d2d8abdcfef389726e20fa834ba:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^