Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8b177825b33b8c278f7c0c2933b367a2f24b77232cc9af42317e6e8fe08d7081:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^