Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 99f03db96bd68e397452b4bde14eadcf5d89f1a7bec0ae13c9a86ce56d6cf0db:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^