Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3e7e45cae109c403b139b050417d6fc1c10f7d04280ac2a73846bf998684ac6c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^