Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> be9cfe47a246fe3834a2d25a95dbacb63d22ecefab9ce6f3eb7c4bdad53499f5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^