Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c6352519d72ee9af2c8b8e7636bf1982a181a00fb1487d690420c4ab9f331afc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^