Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ae38bf4fdcea1c6567e8224e5b7b52a0c055b2bd50ea5cf205d8b76acc5188eb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^