Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 862a3e091495ff7bd2d8ff0b2d7b2ed3cecba9c7023b8ef2718cf432fe176da5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^