Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c19f74aa3ffc689ad4eee8493a603fa2ca21c98630469e57ded7ef1596b61b5c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^