Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b6c1f9bf712de38d56669314afa3a2a13db1e37473dd700c1ba5b4b8ebf82938:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^