Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1e677f960c077c19fc9681ae82348c3265804545f46bb40a11371c157fbdb082:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^