Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4c2450a3da9b49d87a4c6bcd4068ff35597ce7809b10e9027bd21a35bd2f89f1:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^