Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1241a7db94400a06369b09bec1cf686c27079d77ae71012dc8daab446087239d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^