Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7c9610ffaa15b6d49f8326a75cf16be04ee13f49682f6776dcc5f1190493fdf9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^