Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3a85f6c3179f4a6175d88b664e93022f8d56f06fc9989954b440cef6c2ec47cb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^