Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 65b37f12c96d5e478d2af9c90c1fd2b4d17ddb774b14ba4f222e4729c1b28de3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^