Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 12b173bc00f3f1586a3cb902dd28d58d9583e7b7fe6bd80aa491b70d5c8d02af:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^