Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f186ce3aa380ae0041dd118f11fe8231a5483681f5fa8250aec07a22bf7f9fc5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^