Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f7d36ff0925a52218e63b160c91de95e8c4e439313ded1f262bf240351626275:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^