Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4bae956a4e0abf43d34e59d88b6a0625c391be42d462d1cd60c417eda36dfbd6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^