Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a47dc503c29d4612e8ddd6b0f7c3aa5ac3c9de672f7d15ba229a687d2ed1b8ff:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^