Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 11ab4a4e53266115c4a938bbc9fbdbcbe889eb282ca8e7c6a9dd2630796a545a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^