Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 68eb5b4063f7caeede76990344f26a9b78c83afba3bef6e9ca7d481c1a8ef098:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^