Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 20735a5286f6d94199d70177fbae710a64beabcbbd50e2e6e26cb6c4fd03b45b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^