Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 403f247fec82380abfcca5a23938c7da13fa8377eb6a5f3c4fc4eff1df2eeeb6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^