Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3f5cebb721e28db6aac58d5fb9968e7d6c141613d2a5264734db1a9da66e466b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^