Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 650b34df8ce180e6df8c26eb7861a84d0a66bbd6f3a96dbc9aca969647bb3e7e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^