Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ba258fad1a8b36830c4e807ffefc38ee0c5d179ae5bec7fde53e2aa3b031dc7f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^