Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ea4c09c1210bea218d43ad725c0bf1ecd82830d79bcb4aa012e1ab36d9add125:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^