Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> af28948554b6350436c084f8a9fab3ff8a38a6140c560a7881d118fc19bc0d01:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^