Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0ddf52c9f79d64445a2e0e27ff0c292ba944f4f5012dc60150f6db222991542b:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^