Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ba10e13e059bddb9a87bb3f231bb3da8d3e81990d5793acce48746d61dbf42d7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^