Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e249ed3413f8b4768ab21284da23f6e7de5e8aeedb03698ca7fdb4cbfaddeeb5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^