Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> dec5723debc7544374d5cd4cbddc41e648bae4b4dc39c4b4a0a76d4cf5a5884e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^