Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0bd259ebb770af2baa02dbf5cb8f258b1bc677b8fa2bf70c9ab47da630453b53:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^