Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e4e9cb2b376be9177fba9fd4cfbacc8e0cdc36b29c083a471300f6d7aa22b75e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^