Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 34e9aa234fb3cfb7bd484543eedd46bc0b85bb57000c45c8a75e2dd161f65b57:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^