Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 53e563f1db51c0d6c7c41c7bcfd14d41c56840948c3164f1d1d4fdaae378ba5c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^