Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f9b650071557488db7d0ee4ceeffaa7a191b8ad4fe633f3e8973a567343eb8f9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^