Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 880a07b6679686975431bf0ad7872c40c3eff9cb6d19395630af7e35dd4f6f7a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^