Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> edd3952bf1461cb18dc2baed1034597f45c9db0e1c5986d3c184cbea53e45e8b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^