Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 769889ef95cd97e5f2cbfdb95c2d4c90e040ed6d41b899ff1eef4c059f876bf9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^