Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> cdde692f796ae144e7df9239a6462e9cf6ca0fd8a5b4ee24e76e916f55ab9f4f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^