Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b7bd4687ad82bf362cffa2eaa60da52e9e662649dd8cebf8ff3aa42d8d610fc5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^