Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0dd747fd8e5b8439800f6da635bef0b0dbb723b6ac8bdb6e90be97072b4aab4c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^