Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f004c9d030340a5fa9d033e3ba77363443d94e8e9ac1729f73bb1a46b5e13ea9:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^