Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f6813fb2d3e2c0072435c8b63801e63dc75e8de0956a3f60c641f0c84a63d256:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^