Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> feacf30c81a67000d57683190b975926c208ab50bfee377f9e060a07fbb6246e:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^