Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ab9ad4541e8a913d05418e61c4cee1a209336329ac15c9d86a0a799c26bc4c21:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^