Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9f7f8be0877df6600b6b026e41835fe41100d477c60b1bd45da42ad8d4c23fea:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^