Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 938fab3316b3f69720d664ffd7abc29b52aff354d8cbbdfad5b6bb1d2be1fb3d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^