Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0ac11064f0d6e4d332ba6e9284db556605c74b6e7409cc0f581bd493da5ce03c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^