Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d32a03df9e7807ff033344b006bec3692e1f7dacf3bf66fe7ce4abc53ed9f4c0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^