Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 233a59d2cf5fcd690bab4bf0ed3aab82a7c3404d45367370143ba66f9faa7ee0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^