Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c3bcdd25f710b8045a235b9a9d286ae29d1e2780bf0b1a1e98636959990fbeb6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^