Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0cdeacec4c06dfe7c63d56b8cd4263e7eef9fe4cbf4c76b08dd288c9bc200e9b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^