Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c56d1eb3ebbb7b9a47dfc4470db71359fe3ab746e06267045066eaf006ae606e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^