Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3b94a65cb5ad614dc90b75898bb56f0ad20109987d5188f58c57116208840ed6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^