Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3863d31747c08f7933904b1028e38b81b70ca7d9857bfa2d0e7c4dfc98d845eb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^