Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4c1e9daaf5084de0eb822c586bb3e82dc511155a1fd7cff0e3d6a3b820269ba8:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^