Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1f11b76e50c272a19bf0653c34a328167cd904665af6c7e1fbd51d1bbedbf35d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^