Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8b3305b6f1ff93d67b09eec8ca6cdbc0eaf56e075d9bb28c3805d29b3305ca75:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^