Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c78046f439558bd5a4060e0ec9897814e935ae444a1daec75f122c87b002a233:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^