Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c645f84feca61e78cda8771e5ebf97aa057a971477e86f00308eada67e35c284:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^