Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3d59994ae79febd2cbb8a6525702d7202144f9b4f9de096afb1e1aa4c184c358:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^