Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 431c70ba4a554f1d3d30708bac37fe435a9c6c5038dcbc4d7622dcd18a4b86e1:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^