Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 96647f69ed29434aa0b67bbf7ff0edc93e4ffa8e370d8e257292a829a3613b19:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^