Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 23dd8e0f38bfe5fe20872e2a8646ab94b41ccad5b5cb1f762b4a00dc37de4d3b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^