Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 81de2b3a73f389ab012823b7f999352ad8a21f79f9386b3f4f5818101d87f8e0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^