Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7dab3b940483c81de16ba95ca9a61a25ef1e9fe337fd3f18d31f6ad2dbc90ad3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^