Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 33903e0305d17ec38383fe495ee14601b9785cd7c310bb52ea04ddcf3dbb9daf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^