Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 67f8ae984d92782fd91338cdd54f3910b4512194733f3c112cf4ab24af9327f0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^