Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5009528e8f2dc45a8fceef0d95c576a33c4cb8e0b82b01b8c1e0cbf58d06db7e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^