Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5cd5c43e1176bf367d8171f9bdc328977932350367fe72d4dcfd6fe4aef6f1e0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^