Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d4878025f380f68d87b45f67d8cc37a37de189c31c0cad9cf42d4bcc23d4dc04:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^