Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7057250cf09d3bae2ad2ef333fbd1dd3217bbbb2bfa137f439b5ff5f297f51fb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^