Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6b796b0a26125ef98292ec7f922fb4326a4434fb8c5fd10462acb06bcb9224b4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^