Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 71fc20142399cd43ea4beac91141a4e86fb5ba8aa7a6ca47444891fd3e20f91f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^