Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8414a8a98a940cb28f62d9cd5d9c1d5e93842ae36ea21180571ca4b8090cf363:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^