Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 80d60be1b0f70b07df50e62f37bb41f93ba6e69accf2abb0ff646e793d22b9fb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^