Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1d3e77f6eb2f0c55327220784eb1fcfdac923b3e1950bfaa68af937861d40e7b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^