Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8effbb794c9f70a7dde50978c2b284748c55dcfd24d6194154bd0ee4e9c31f63:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^