Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2ddd41eec6233f37c04f164f8736904fa00690b5f5a58dc785fe81ec80181f9c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^