Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c050abfd5d46e8698f035e1d5bb8b4214a8efcd60e40c53bd2cfa6b4ba876b8d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^