Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 03dac918413ebd8e3d090287116dac4ed164b6a3e9fed62a19ca0a9e9880cc9c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^