Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ab0e8fb9be9bc5971da51ac25c6ec6215524f55170eb36f7b4c7aa6f260b7f09:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^