Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7dc0cdc575c76a78d491beea0a2bca07b9cb91cc1d5db00a33030cabcbffb7f7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^