Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 69ceddbc710056680e2323392b7c24294016f1848a261f4a3ea266ed636acebf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^