Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1a1f0cb396fa407cbe5fb4bddf278a134177de0f9eadc439d3ce3173c92719e7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^