Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6c6e668820d9eeac1045c6ea2d35fd86ba277dc50ddce18a1d8c8b2742f10ee2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^