Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f82be54073d2242bd30072dcf8f7d93d55cbfae3cbafd8bd0cfb1c9957c8d1e4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^