Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 269b6a6962227da11edb5c7585f94a14e00a90157d6ec3955ae99bdaf0b4730e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^