Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 23f93d20b9b62d8477496c3d5afabb7695cc3fdc87d65e0aff6711ccbf7ab2be:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^